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Railway | Wikipedia audio article

Railway | Wikipedia audio article


Rail transport or train transport is a means
of transferring passengers and goods on wheeled vehicles running on rails, which are located
on tracks. In contrast to road transport, where vehicles run on a prepared flat surface,
rail vehicles (rolling stock) are directionally guided by the tracks on which they run. Tracks
usually consist of steel rails, installed on ties (sleepers) set in ballast, on which
the rolling stock, usually fitted with metal wheels, moves. Other variations are also possible,
such as slab track. This is where the rails are fastened to a concrete foundation resting
on a prepared subsurface. Rolling stock in a rail transport system generally
encounters lower frictional resistance than rubber-tired road vehicles, so passenger and
freight cars (carriages and wagons) can be coupled into longer trains. The operation
is carried out by a railway company, providing transport between train stations or freight
customer facilities. Power is provided by locomotives which either draw electric power
from a railway electrification system or produce their own power, usually by diesel engines.
Most tracks are accompanied by a signalling system. Railways are a safe land transport
system when compared to other forms of transport. Railway transport is capable of high levels
of passenger and cargo utilization and energy efficiency, but is often less flexible and
more capital-intensive than road transport, when lower traffic levels are considered.
The oldest known, man/animal-hauled railways date back to the 6th century BC in Corinth,
Greece. Rail transport then commenced in mid 16th century in Germany in the form of horse-powered
funiculars and wagonways. Modern rail transport commenced with the British development of
the steam locomotives in the early 19th century. Thus the railway system in Great Britain is
the oldest in the world. Built by George Stephenson and his son Robert’s company Robert Stephenson
and Company, the Locomotion No. 1 is the first steam locomotive to carry passengers on a
public rail line, the Stockton and Darlington Railway in 1825. George Stephenson also built
the first public inter-city railway line in the world to use only the steam locomotives
all the time, the Liverpool and Manchester Railway which opened in 1830. With steam engines,
one could construct mainline railways, which were a key component of the Industrial Revolution.
Also, railways reduced the costs of shipping, and allowed for fewer lost goods, compared
with water transport, which faced occasional sinking of ships. The change from canals to
railways allowed for “national markets” in which prices varied very little from city
to city. The spread of the railway network and the use of railway timetables, led to
the standardisation of time (railway time) in Britain based on Greenwich Mean Time. Prior
to this, major towns and cities varied their local time relative to GMT. The invention
and development of the railway in the United Kingdom was one of the most important technological
inventions of the 19th century. The world’s first underground railway, the Metropolitan
Railway (part of the London Underground), opened in 1863.
In the 1880s, electrified trains were introduced, leading to electrification of tramways and
rapid transit systems. Starting during the 1940s, the non-electrified railways in most
countries had their steam locomotives replaced by diesel-electric locomotives, with the process
being almost complete by the 2000s. During the 1960s, electrified high-speed railway
systems were introduced in Japan and later in some other countries. Many countries are
in the process of replacing diesel locomotives with electric locomotives, mainly due to environmental
concerns, a notable example being Switzerland, which has completely electrified its network.
Other forms of guided ground transport outside the traditional railway definitions, such
as monorail or maglev, have been tried but have seen limited use.
Following a decline after World War II due to competition from cars and airplanes, rail
transport has had a revival in recent decades due to road congestion and rising fuel prices,
as well as governments investing in rail as a means of reducing CO2 emissions in the context
of concerns about global warming.==History==The history of rail transport began in the
6th century BC in Ancient Greece. It can be divided up into several discrete periods defined
by the principal means of track material and motive power used.===Ancient systems===
Evidence indicates that there was 6 to 8.5 km long Diolkos paved trackway, which transported
boats across the Isthmus of Corinth in Greece from around 600 BC. Wheeled vehicles pulled
by men and animals ran in grooves in limestone, which provided the track element, preventing
the wagons from leaving the intended route. The Diolkos was in use for over 650 years,
until at least the 1st century AD. The paved trackways were also later built in Roman Egypt.===Pre-steam=======
Wooden rails introduced====In 1515, Cardinal Matthäus Lang wrote a description
of the Reisszug, a funicular railway at the Hohensalzburg Fortress in Austria. The line
originally used wooden rails and a hemp haulage rope and was operated by human or animal power,
through a treadwheel. The line still exists and is operational, although in updated form
and is possibly the oldest operational railway. Wagonways (or tramways) using wooden rails,
hauled by horses, started appearing in the 1550s to facilitate the transport of ore tubs
to and from mines, and soon became popular in Europe. Such an operation was illustrated
in Germany in 1556 by Georgius Agricola in his work De re metallica. This line used “Hund”
carts with unflanged wheels running on wooden planks and a vertical pin on the truck fitting
into the gap between the planks to keep it going the right way. The miners called the
wagons Hunde (“dogs”) from the noise they made on the tracks.There are many references
to their use in central Europe in the 16th century. Such a transport system was later
used by German miners at Caldbeck, Cumbria, England, perhaps from the 1560s. A wagonway
was built at Prescot, near Liverpool, sometime around 1600, possibly as early as 1594. Owned
by Philip Layton, the line carried coal from a pit near Prescot Hall to a terminus about
half a mile away. A funicular railway was also made at Broseley in Shropshire some time
before 1604. This carried coal for James Clifford from his mines down to the river Severn to
be loaded onto barges and carried to riverside towns. The Wollaton Wagonway, completed in
1604 by Huntingdon Beaumont, has sometimes erroneously been cited as the earliest British
railway. It ran from Strelley to Wollaton near Nottingham.The Middleton Railway in Leeds,
which was built in 1758, later became the world’s oldest operational railway (other
than funiculars), albeit now in an upgraded form. In 1764, the first railway in the Americas
was built in Lewiston, New York.====Metal rails introduced====
In the late 1760s, the Coalbrookdale Company began to fix plates of cast iron to the upper
surface of the wooden rails. This allowed a variation of gauge to be used. At first
only balloon loops could be used for turning, but later, movable points were taken into
use that allowed for switching. A system was introduced in which unflanged
wheels ran on L-shaped metal plates – these became known as plateways. John Curr, a Sheffield
colliery manager, invented this flanged rail in 1787, though the exact date of this is
disputed. The plate rail was taken up by Benjamin Outram for wagonways serving his canals, manufacturing
them at his Butterley ironworks. In 1803, William Jessop opened the Surrey Iron Railway,
a double track plateway, erroneously sometimes cited as world’s first public railway, in
south London. Meanwhile, William Jessop had earlier used
a form of all-iron edge rail and flanged wheels successfully for an extension to the Charnwood
Forest Canal at Nanpantan, Loughborough, Leicestershire in 1789. In 1790, Jessop and his partner Outram
began to manufacture edge-rails. Jessop became a partner in the Butterley Company in 1790.
The first public edgeway (thus also first public railway) built was Lake Lock Rail Road
in 1796. Although the primary purpose of the line was to carry coal, it also carried passengers.
These two systems of constructing iron railways, the “L” plate-rail and the smooth edge-rail,
continued to exist side by side until well into the early 19th century. The flanged wheel
and edge-rail eventually proved its superiority and became the standard for railways.
Cast iron used in rails proved unsatisfactory because it was brittle and broke under heavy
loads. The wrought iron invented by John Birkinshaw in 1820 replaced cast iron. Wrought iron (usually
simply referred to as “iron”) was a ductile material that could undergo considerable deformation
before breaking, making it more suitable for iron rails. But iron was expensive to produce
until Henry Cort patented the puddling process in 1784. In 1783 Cort also patented the rolling
process, which was 15 times faster at consolidating and shaping iron than hammering. These processes
greatly lowered the cost of producing iron and rails. The next important development
in iron production was hot blast developed by James Beaumont Neilson (patented 1828),
which considerably reduced the amount of coke (fuel) or charcoal needed to produce pig iron.
Wrought iron was a soft material that contained slag or dross. The softness and dross tended
to make iron rails distort and delaminate and they lasted less than 10 years. Sometimes
they lasted as little as one year under high traffic. All these developments in the production
of iron eventually led to replacement of composite wood/iron rails with superior all iron rails.
The introduction of the Bessemer process, enabling steel to be made inexpensively, led
to the era of great expansion of railways that began in the late 1860s. Steel rails
lasted several times longer than iron. Steel rails made heavier locomotives possible, allowing
for longer trains and improving the productivity of railroads. The Bessemer process introduced
nitrogen into the steel, which caused the steel to become brittle with age. The open
hearth furnace began to replace the Bessemer process near the end of the 19th century,
improving the quality of steel and further reducing costs. Thus steel completely replaced
the use of iron in rails, becoming standard for all railways.
The first passenger horsecar or tram, Swansea and Mumbles Railway was opened between Swansea
and Mumbles in Wales in 1807. Horses remained the preferable mode for tram transport even
after the arrival of steam engines until the end of the 19th century, because they were
cleaner compared to steam driven trams which caused smoke in city streets.===Steam power introduced===In 1784 James Watt, a Scottish inventor and
mechanical engineer, patented a design for a steam locomotive. Watt had improved the
steam engine of Thomas Newcomen, hitherto used to pump water out of mines, and developed
a reciprocating engine in 1769 capable of powering a wheel. This was a large stationary
engine, powering cotton mills and a variety of machinery; the state of boiler technology
necessitated the use of low pressure steam acting upon a vacuum in the cylinder, which
required a separate condenser and an air pump. Nevertheless, as the construction of boilers
improved, Watt investigated the use of high-pressure steam acting directly upon a piston, raising
the possibility of a smaller engine that might be used to power a vehicle. Following his
patent, Watt’s employee William Murdoch produced a working model of a self-propelled steam
carriage in that year. The first full-scale working railway steam
locomotive was built in the United Kingdom in 1804 by Richard Trevithick, a British engineer
born in Cornwall. This used high-pressure steam to drive the engine by one power stroke.
The transmission system employed a large flywheel to even out the action of the piston rod.
On 21 February 1804, the world’s first steam-powered railway journey took place when Trevithick’s
unnamed steam locomotive hauled a train along the tramway of the Penydarren ironworks, near
Merthyr Tydfil in South Wales. Trevithick later demonstrated a locomotive operating
upon a piece of circular rail track in Bloomsbury, London, the Catch Me Who Can, but never got
beyond the experimental stage with railway locomotives, not least because his engines
were too heavy for the cast-iron plateway track then in use. The first commercially successful steam locomotive
was Matthew Murray’s rack locomotive Salamanca built for the Middleton Railway in Leeds in
1812. This twin-cylinder locomotive was light enough to not break the edge-rails track and
solved the problem of adhesion by a cog-wheel using teeth cast on the side of one of the
rails. Thus it was also the first rack railway. This was followed in 1813 by the locomotive
Puffing Billy built by Christopher Blackett and William Hedley for the Wylam Colliery
Railway, the first successful locomotive running by adhesion only. This was accomplished by
the distribution of weight between a number of wheels. Puffing Billy is now on display
in the Science Museum in London, making it the oldest locomotive in existence. In 1814 George Stephenson, inspired by the
early locomotives of Trevithick, Murray and Hedley, persuaded the manager of the Killingworth
colliery where he worked to allow him to build a steam-powered machine. Stephenson played
a pivotal role in the development and widespread adoption of the steam locomotive. His designs
considerably improved on the work of the earlier pioneers. He built the locomotive Blücher,
also a successful flanged-wheel adhesion locomotive. In 1825 he built the locomotive Locomotion
for the Stockton and Darlington Railway in the north east of England, which became the
first public steam railway in the world in 1825, although it used both horse power and
steam power on different runs. In 1829, he built the locomotive Rocket, which entered
in and won the Rainhill Trials. This success led to Stephenson establishing his company
as the pre-eminent builder of steam locomotives for railways in Great Britain and Ireland,
the United States, and much of Europe. The first public railway which used only steam
locomotives, all the time, was Liverpool and Manchester Railway, built in 1830.
Steam power continued to be the dominant power system in railways around the world for more
than a century.===Electric power introduced===The first known electric locomotive was built
in 1837 by chemist Robert Davidson of Aberdeen in Scotland, and it was powered by galvanic
cells (batteries). Thus it was also the earliest battery electric locomotive. Davidson later
built a larger locomotive named Galvani, exhibited at the Royal Scottish Society of Arts Exhibition
in 1841. The seven-ton vehicle had two direct-drive reluctance motors, with fixed electromagnets
acting on iron bars attached to a wooden cylinder on each axle, and simple commutators. It hauled
a load of six tons at four miles per hour (6 kilometers per hour) for a distance of
one and a half miles (2.4 kilometres). It was tested on the Edinburgh and Glasgow Railway
in September of the following year, but the limited power from batteries prevented its
general use. It was destroyed by railway workers, who saw it as a threat to their job security. Werner von Siemens demonstrated an electric
railway in 1879 in Berlin. The world’s first electric tram line, Gross-Lichterfelde Tramway,
opened in Lichterfelde near Berlin, Germany, in 1881. It was built by Siemens. The tram
ran on 180 Volt DC, which was supplied by running rails. In 1891 the track was equipped
with an overhead wire and the line was extended to Berlin-Lichterfelde West station. The Volk’s
Electric Railway opened in 1883 in Brighton, England. The railway is still operational,
thus making it the oldest operational electric railway in the world. Also in 1883, Mödling
and Hinterbrühl Tram opened near Vienna in Austria. It was the first tram line in the
world in regular service powered from an overhead line. Five years later, in the U.S. electric
trolleys were pioneered in 1888 on the Richmond Union Passenger Railway, using equipment designed
by Frank J. Sprague. The first use of electrification on a main
line was on a four-mile section of the Baltimore Belt Line of the Baltimore and Ohio Railroad
(B&O) in 1895 connecting the main portion of the B&O to the new line to New York through
a series of tunnels around the edges of Baltimore’s downtown. Electricity quickly became the power
supply of choice for subways, abetted by the Sprague’s invention of multiple-unit train
control in 1897. By the early 1900s most street railways were electrified. The London Underground, the world’s oldest
underground railway, opened in 1863, and it began operating electric services using a
fourth rail system in 1890 on the City and South London Railway, now part of the London
Underground Northern line. This was the first major railway to use electric traction. The
world’s first deep-level electric railway, it runs from the City of London, under the
River Thames, to Stockwell in south London. The first practical AC electric locomotive
was designed by Charles Brown, then working for Oerlikon, Zürich. In 1891, Brown had
demonstrated long-distance power transmission, using three-phase AC, between a hydro-electric
plant at Lauffen am Neckar and Frankfurt am Main West, a distance of 280 km. Using experience
he had gained while working for Jean Heilmann on steam-electric locomotive designs, Brown
observed that three-phase motors had a higher power-to-weight ratio than DC motors and,
because of the absence of a commutator, were simpler to manufacture and maintain. However,
they were much larger than the DC motors of the time and could not be mounted in underfloor
bogies: they could only be carried within locomotive bodies.In 1894, Hungarian engineer
Kálmán Kandó developed a new type 3-phase asynchronous electric drive motors and generators
for electric locomotives. Kandó’s early 1894 designs were first applied in a short three-phase
AC tramway in Evian-les-Bains (France), which was constructed between 1896 and 1898.In 1896,
Oerlikon installed the first commercial example of the system on the Lugano Tramway. Each
30-tonne locomotive had two 110 kW (150 hp) motors run by three-phase 750 V 40 Hz fed
from double overhead lines. Three-phase motors run at constant speed and provide regenerative
braking, and are well suited to steeply graded routes, and the first main-line three-phase
locomotives were supplied by Brown (by then in partnership with Walter Boveri) in 1899
on the 40 km Burgdorf–Thun line, Switzerland. Italian railways were the first in the world
to introduce electric traction for the entire length of a main line rather than a short
section. The 106 km Valtellina line was opened on 4 September 1902, designed by Kandó and
a team from the Ganz works. The electrical system was three-phase at 3 kV 15 Hz. In 1918,
Kandó invented and developed the rotary phase converter, enabling electric locomotives to
use three-phase motors whilst supplied via a single overhead wire, carrying the simple
industrial frequency (50 Hz) single phase AC of the high voltage national networks.An
important contribution to the wider adoption of AC traction came from SNCF of France after
World War II. The company conducted trials at AC 50 HZ, and established it as a standard.
Following SNCF’s successful trials, 50 HZ, now also called industrial frequency was adopted
as standard for main-lines across the world.===Diesel power introduced===Earliest recorded examples of an internal
combustion engine for railway use included a prototype designed by William Dent Priestman,
which was examined by Sir William Thomson in 1888 who described it as a “[Priestman
oil engine] mounted upon a truck which is worked on a temporary line of rails to show
the adaptation of a petroleum engine for locomotive purposes.”. In 1894, a 20 hp (15 kW) two axle
machine built by Priestman Brothers was used on the Hull Docks.In 1906, Rudolf Diesel,
Adolf Klose and the steam and diesel engine manufacturer Gebrüder Sulzer founded Diesel-Sulzer-Klose
GmbH to manufacture diesel-powered locomotives. Sulzer had been manufacturing diesel engines
since 1898. The Prussian State Railways ordered a diesel locomotive from the company in 1909.
The world’s first diesel-powered locomotive was operated in the summer of 1912 on the
Winterthur–Romanshorn railway in Switzerland, but was not a commercial success. The locomotive
weight was 95 tonnes and the power was 883 kW with a maximum speed of 100 km/h. Small
numbers of prototype diesel locomotives were produced in a number of countries through
the mid-1920s. A significant breakthrough occurred in 1914,
when Hermann Lemp, a General Electric electrical engineer, developed and patented a reliable
direct current electrical control system (subsequent improvements were also patented by Lemp).
Lemp’s design used a single lever to control both engine and generator in a coordinated
fashion, and was the prototype for all diesel–electric locomotive control systems. In 1914, world’s
first functional diesel–electric railcars were produced for the Königlich-Sächsische
Staatseisenbahnen (Royal Saxon State Railways) by Waggonfabrik Rastatt with electric equipment
from Brown, Boveri & Cie and diesel engines from Swiss Sulzer AG. They were classified
as DET 1 and DET 2 (de.wiki). The first regular use of diesel–electric locomotives was in
switching (shunter) applications. General Electric produced several small switching
locomotives in the 1930s (the famous “44-tonner” switcher was introduced in 1940) Westinghouse
Electric and Baldwin collaborated to build switching locomotives starting in 1929.
In 1929, the Canadian National Railways became the first North American railway to use diesels
in mainline service with two units, 9000 and 9001, from Westinghouse.===High-speed rail===Although high-speed steam and diesel services
were started before the 1960s in Europe, they were not very successful. The first electrified high-speed rail Tōkaidō
Shinkansen was introduced in 1964 between Tokyo and Osaka in Japan. Since then high-speed
rail transport, functioning at speeds up to and above 300 km/h, has been built in Japan,
Spain, France, Germany, Italy, the People’s Republic of China, Taiwan (Republic of China),
the United Kingdom, South Korea, Scandinavia, Belgium and the Netherlands. The construction
of many of these lines has resulted in the dramatic decline of short haul flights and
automotive traffic between connected cities, such as the London–Paris–Brussels corridor,
Madrid–Barcelona, Milan–Rome–Naples, as well as many other major lines.High-speed
trains normally operate on standard gauge tracks of continuously welded rail on grade-separated
right-of-way that incorporates a large turning radius in its design. While high-speed rail
is most often designed for passenger travel, some high-speed systems also offer freight
service.==Trains==A train is a connected series of rail vehicles
that move along the track. Propulsion for the train is provided by a separate locomotive
or from individual motors in self-propelled multiple units. Most trains carry a revenue
load, although non-revenue cars exist for the railway’s own use, such as for maintenance-of-way
purposes. The engine driver (engineer in North America) controls the locomotive or other
power cars, although people movers and some rapid transits are under automatic control.===Haulage===Traditionally, trains are pulled using a locomotive.
This involves one or more powered vehicles being located at the front of the train, providing
sufficient tractive force to haul the weight of the full train. This arrangement remains
dominant for freight trains and is often used for passenger trains. A push–pull train
has the end passenger car equipped with a driver’s cab so that the engine driver can
remotely control the locomotive. This allows one of the locomotive-hauled train’s drawbacks
to be removed, since the locomotive need not be moved to the front of the train each time
the train changes direction. A railroad car is a vehicle used for the haulage of either
passengers or freight. A multiple unit has powered wheels throughout
the whole train. These are used for rapid transit and tram systems, as well as many
both short- and long-haul passenger trains. A railcar is a single, self-powered car, and
may be electrically-propelled or powered by a diesel engine. Multiple units have a driver’s
cab at each end of the unit, and were developed following the ability to build electric motors
and engines small enough to fit under the coach. There are only a few freight multiple
units, most of which are high-speed post trains.===Motive power===Steam locomotives are locomotives with a steam
engine that provides adhesion. Coal, petroleum, or wood is burned in a firebox, boiling water
in the boiler to create pressurized steam. The steam travels through the smokebox before
leaving via the chimney or smoke stack. In the process, it powers a piston that transmits
power directly through a connecting rod (US: main rod) and a crankpin (US: wristpin) on
the driving wheel (US main driver) or to a crank on a driving axle. Steam locomotives
have been phased out in most parts of the world for economical and safety reasons, although
many are preserved in working order by heritage railways.
Electric locomotives draw power from a stationary source via an overhead wire or third rail.
Some also or instead use a battery. In locomotives that are powered by high voltage alternating
current, a transformer in the locomotive converts the high voltage, low current power to low
voltage, high current used in the traction motors that power the wheels. Modern locomotives
may use three-phase AC induction motors or direct current motors. Under certain conditions,
electric locomotives are the most powerful traction. They are also the cheapest to run
and provide less noise and no local air pollution. However, they require high capital investments
both for the overhead lines and the supporting infrastructure, as well as the generating
station that is needed to produce electricity. Accordingly, electric traction is used on
urban systems, lines with high traffic and for high-speed rail.
Diesel locomotives use a diesel engine as the prime mover. The energy transmission may
be either diesel-electric, diesel-mechanical or diesel-hydraulic but diesel-electric is
dominant. Electro-diesel locomotives are built to run as diesel-electric on unelectrified
sections and as electric locomotives on electrified sections.
Alternative methods of motive power include magnetic levitation, horse-drawn, cable, gravity,
pneumatics and gas turbine.===Passenger trains===
A passenger train travels between stations where passengers may embark and disembark.
The oversight of the train is the duty of a guard/train manager/conductor. Passenger
trains are part of public transport and often make up the stem of the service, with buses
feeding to stations. Passenger trains provide long-distance intercity travel, daily commuter
trips, or local urban transit services. They even include a diversity of vehicles, operating
speeds, right-of-way requirements, and service frequency. Passenger trains usually can be
divided into two operations: intercity railway and intracity transit. Whereas as intercity
railway involve higher speeds, longer routes, and lower frequency (usually scheduled), intracity
transit involves lower speeds, shorter routes, and higher frequency (especially during peak
hours). Intercity trains are long-haul trains that
operate with few stops between cities. Trains typically have amenities such as a dining
car. Some lines also provide over-night services with sleeping cars. Some long-haul trains
have been given a specific name. Regional trains are medium distance trains that connect
cities with outlying, surrounding areas, or provide a regional service, making more stops
and having lower speeds. Commuter trains serve suburbs of urban areas, providing a daily
commuting service. Airport rail links provide quick access from city centres to airports.
High-speed rail are special inter-city trains that operate at much higher speeds than conventional
railways, the limit being regarded at 200 to 320 kilometres per hour (120 to 200 mph).
High-speed trains are used mostly for long-haul service and most systems are in Western Europe
and East Asia. The speed record is 574.8 km/h (357.2 mph), set by a modified French TGV.
Magnetic levitation trains such as the Shanghai airport train use under-riding magnets which
attract themselves upward towards the underside of a guideway and this line has achieved somewhat
higher peak speeds in day-to-day operation than conventional high-speed railways, although
only over short distances. Due to their heightened speeds, route alignments for high-speed rail
tend to have shallower grades and broader curves than conventional railways.
Their high kinetic energy translates to higher horsepower-to-ton ratios (e.g. 20 horsepower
per short ton or 16 kilowatts per tonne); this allows trains to accelerate and maintain
higher speeds and negotiate steep grades as momentum builds up and recovered in downgrades
(reducing cut, fill, and tunnelling requirements). Since lateral forces act on curves, curvatures
are designed with the highest possible radius. All these features are dramatically different
from freight operations, thus justifying exclusive high-speed rail lines if it is economically
feasible.Higher-speed rail services are intercity rail services that have top speeds higher
than conventional intercity trains but the speeds are not as high as those in the high-speed
rail services. These services are provided after improvements to the conventional rail
infrastructure in order to support trains that can operate safely at higher speeds. Rapid transit is an intracity system built
in large cities and has the highest capacity of any passenger transport system. It is usually
grade-separated and commonly built underground or elevated. At street level, smaller trams
can be used. Light rails are upgraded trams that have step-free access, their own right-of-way
and sometimes sections underground. Monorail systems are elevated, medium-capacity systems.
A people mover is a driverless, grade-separated train that serves only a few stations, as
a shuttle. Due to the lack of uniformity of rapid transit systems, route alignment varies,
with diverse rights-of-way (private land, side of road, street median) and geometric
characteristics (sharp or broad curves, steep or gentle grades). For instance, the Chicago
‘L’ trains are designed with extremely short cars to negotiate the sharp curves in the
Loop. New Jersey’s PATH has similar-sized cars to accommodate curves in the trans-Hudson
tunnels. San Francisco’s BART operates large cars on its routes.===Freight train===A freight train hauls cargo using freight
cars specialized for the type of goods. Freight trains are very efficient, with economy of
scale and high energy efficiency. However, their use can be reduced by lack of flexibility,
if there is need of transshipment at both ends of the trip due to lack of tracks to
the points of pick-up and delivery. Authorities often encourage the use of cargo rail transport
due to its fame.Container trains have become the beta type in the US for bulk haulage.
Containers can easily be transshipped to other modes, such as ships and trucks, using cranes.
This has succeeded the boxcar (wagon-load), where the cargo had to be loaded and unloaded
into the train manually. The intermodal containerization of cargo has revolutionized the supply chain
logistics industry, reducing ship costs significantly. In Europe, the sliding wall wagon has largely
superseded the ordinary covered wagons. Other types of cars include refrigerator cars, stock
cars for livestock and autoracks for road vehicles. When rail is combined with road
transport, a roadrailer will allow trailers to be driven onto the train, allowing for
easy transition between road and rail. Bulk handling represents a key advantage for
rail transport. Low or even zero transshipment costs combined with energy efficiency and
low inventory costs allow trains to handle bulk much cheaper than by road. Typical bulk
cargo includes coal, ore, grains and liquids. Bulk is transported in open-topped cars, hopper
cars and tank cars.==Infrastructure=====
Right of way===Railway tracks are laid upon land owned or
leased by the railway company. Owing to the desirability of maintaining modest grades,
rails will often be laid in circuitous routes in hilly or mountainous terrain. Route length
and grade requirements can be reduced by the use of alternating cuttings, bridges and tunnels
– all of which can greatly increase the capital expenditures required to develop a
right of way, while significantly reducing operating costs and allowing higher speeds
on longer radius curves. In densely urbanized areas, railways are sometimes laid in tunnels
to minimize the effects on existing properties.===Track===Track consists of two parallel steel rails,
anchored perpendicular to members called ties (sleepers) of timber, concrete, steel, or
plastic to maintain a consistent distance apart, or rail gauge. Rail gauges are usually
categorized as standard gauge (used on approximately 55% of the world’s existing railway lines),
broad gauge, and narrow gauge. In addition to the rail gauge, the tracks will be laid
to conform with a Loading gauge which defines the maximum height and width for railway vehicles
and their loads to ensure safe passage through bridges, tunnels and other structures.
The track guides the conical, flanged wheels, keeping the cars on the track without active
steering and therefore allowing trains to be much longer than road vehicles. The rails
and ties are usually placed on a foundation made of compressed earth on top of which is
placed a bed of ballast to distribute the load from the ties and to prevent the track
from buckling as the ground settles over time under the weight of the vehicles passing above.
The ballast also serves as a means of drainage. Some more modern track in special areas is
attached by direct fixation without ballast. Track may be prefabricated or assembled in
place. By welding rails together to form lengths of continuous welded rail, additional wear
and tear on rolling stock caused by the small surface gap at the joints between rails can
be counteracted; this also makes for a quieter ride.
On curves the outer rail may be at a higher level than the inner rail. This is called
superelevation or cant. This reduces the forces tending to displace the track and makes for
a more comfortable ride for standing livestock and standing or seated passengers. A given
amount of superelevation is most effective over a limited range of speeds.
Turnouts, also known as points and switches, are the means of directing a train onto a
diverging section of track. Laid similar to normal track, a point typically consists of
a frog (common crossing), check rails and two switch rails. The switch rails may be
moved left or right, under the control of the signalling system, to determine which
path the train will follow. Spikes in wooden ties can loosen over time,
but split and rotten ties may be individually replaced with new wooden ties or concrete
substitutes. Concrete ties can also develop cracks or splits, and can also be replaced
individually. Should the rails settle due to soil subsidence, they can be lifted by
specialized machinery and additional ballast tamped under the ties to level the rails.
Periodically, ballast must be removed and replaced with clean ballast to ensure adequate
drainage. Culverts and other passages for water must be kept clear lest water is impounded
by the trackbed, causing landslips. Where trackbeds are placed along rivers, additional
protection is usually placed to prevent streambank erosion during times of high water. Bridges
require inspection and maintenance, since they are subject to large surges of stress
in a short period of time when a heavy train crosses.===Train inspection systems===
The inspection of railway equipment is essential for the safe movement of trains. Many types
of defect detectors are in use on the world’s railroads. These devices utilize technologies
that vary from a simplistic paddle and switch to infrared and laser scanning, and even ultrasonic
audio analysis. Their use has avoided many rail accidents over the 70 years they have
been used.===Signalling===Railway signalling is a system used to control
railway traffic safely to prevent trains from colliding. Being guided by fixed rails which
generate low friction, trains are uniquely susceptible to collision since they frequently
operate at speeds that do not enable them to stop quickly or within the driver’s sighting
distance; road vehicles, which encounter a higher level of friction between their rubber
tyres and the road surface, have much shorter braking distances. Most forms of train control
involve movement authority being passed from those responsible for each section of a rail
network to the train crew. Not all methods require the use of signals, and some systems
are specific to single track railways. The signalling process is traditionally carried
out in a signal box, a small building that houses the lever frame required for the signalman
to operate switches and signal equipment. These are placed at various intervals along
the route of a railway, controlling specified sections of track. More recent technological
developments have made such operational doctrine superfluous, with the centralization of signalling
operations to regional control rooms. This has been facilitated by the increased use
of computers, allowing vast sections of track to be monitored from a single location. The
common method of block signalling divides the track into zones guarded by combinations
of block signals, operating rules, and automatic-control devices so that only one train may be in a
block at any time.Ethiopia introduced steam rail in 1917.This project was started by King
Minilik II in 1897.===Electrification===The electrification system provides electrical
energy to the trains, so they can operate without a prime mover on board. This allows
lower operating costs, but requires large capital investments along the lines. Mainline
and tram systems normally have overhead wires, which hang from poles along the line. Grade-separated
rapid transit sometimes use a ground third rail.
Power may be fed as direct or alternating current. The most common DC voltages are 600
and 750 V for tram and rapid transit systems, and 1,500 and 3,000 V for mainlines. The two
dominant AC systems are 15 kV AC and 25 kV AC.===Stations===A railway station serves as an area where
passengers can board and alight from trains. A goods station is a yard which is exclusively
used for loading and unloading cargo. Large passenger stations have at least one building
providing conveniences for passengers, such as purchasing tickets and food. Smaller stations
typically only consist of a platform. Early stations were sometimes built with both passenger
and goods facilities.Platforms are used to allow easy access to the trains, and are connected
to each other via underpasses, footbridges and level crossings. Some large stations are
built as culs-de-sac, with trains only operating out from one direction. Smaller stations normally
serve local residential areas, and may have connection to feeder bus services. Large stations,
in particular central stations, serve as the main public transport hub for the city, and
have transfer available between rail services, and to rapid transit, tram or bus services.==Operations=====
Ownership===Since the 1980s, there has been an increasing
trend to split up railway companies, with companies owning the rolling stock separated
from those owning the infrastructure. This is particularly true in Europe, where this
arrangement is required by the European Union. This has allowed open access by any train
operator to any portion of the European railway network. In the UK, the railway track is state
owned, with a public controlled body (Network Rail) running, maintaining and developing
the track, while Train Operating Companies have run the trains since privatization in
the 1990s.In the U.S., virtually all rail networks and infrastructure outside the Northeast
Corridor are privately owned by freight lines. Passenger lines, primarily Amtrak, operate
as tenants on the freight lines. Consequently, operations must be closely synchronized and
coordinated between freight and passenger railroads, with passenger trains often being
dispatched by the host freight railroad. Due to this shared system, both are regulated
by the Federal Railroad Administration (FRA) and may follow the AREMA recommended practices
for track work and AAR standards for vehicles.===Financing===
The main source of income for railway companies is from ticket revenue (for passenger transport)
and shipment fees for cargo. Discounts and monthly passes are sometimes available for
frequent travellers (e.g. season ticket and rail pass). Freight revenue may be sold per
container slot or for a whole train. Sometimes, the shipper owns the cars and only rents the
haulage. For passenger transport, advertisement income can be significant.
Governments may choose to give subsidies to rail operation, since rail transport has fewer
externalities than other dominant modes of transport. If the railway company is state-owned,
the state may simply provide direct subsidies in exchange for increased production. If operations
have been privatized, several options are available. Some countries have a system where
the infrastructure is owned by a government agency or company – with open access to
the tracks for any company that meets safety requirements. In such cases, the state may
choose to provide the tracks free of charge, or for a fee that does not cover all costs.
This is seen as analogous to the government providing free access to roads. For passenger
operations, a direct subsidy may be paid to a public-owned operator, or public service
obligation tender may be helt, and a time-limited contract awarded to the lowest bidder. Total
EU rail subsidies amounted to €73 billion in 2005.Amtrak, the US passenger rail service,
and Canada’s Via Rail are private railroad companies chartered by their respective national
governments. As private passenger services declined because of competition from automobiles
and airlines, they became shareholders of Amtrak either with a cash entrance fee or
relinquishing their locomotives and rolling stock. The government subsidizes Amtrak by
supplying start-up capital and making up for losses at the end of the fiscal year.===Safety===Trains can travel at very high speed, but
they are heavy, are unable to deviate from the track and require a great distance to
stop. Possible accidents include derailment (jumping the track), a collision with another
train or collision with automobiles, other vehicles or pedestrians at level crossings.
The last accounts for the majority of rail accidents and casualties. The most important
safety measures to prevent accidents are strict operating rules, e.g. railway signalling and
gates or grade separation at crossings. Train whistles, bells or horns warn of the presence
of a train, while trackside signals maintain the distances between trains.
An important element in the safety of many high-speed inter-city networks such as Japan’s
Shinkansen is the fact that trains only run on dedicated railway lines, without level
crossings. This effectively eliminates the potential for collision with automobiles,
other vehicles or pedestrians, vastly reduces the likelihood of collision with other trains
and helps ensure services remain timely.===Maintenance===
As in any infrastructure asset, railways must keep up with periodic inspection and maintenance
in order to minimize effect of infrastructure failures that can disrupt freight revenue
operations and passenger services. Because passengers are considered the most crucial
cargo and usually operate at higher speeds, steeper grades, and higher capacity/frequency,
their lines are especially important. Inspection practices include track geometry cars or walking
inspection. Curve maintenance especially for transit services includes gauging, fastener
tightening, and rail replacement. Rail corrugation is a common issue with transit
systems due to the high number of light-axle, wheel passages which result in grinding of
the wheel/rail interface. Since maintenance may overlap with operations, maintenance windows
(nighttime hours, off-peak hours, altering train schedules or routes) must be closely
followed. In addition, passenger safety during maintenance work (inter-track fencing, proper
storage of materials, track work notices, hazards of equipment near states) must be
regarded at all times. At times, maintenance access problems can emerge due to tunnels,
elevated structures, and congested cityscapes. Here, specialized equipment or smaller versions
of conventional maintenance gear are used.Unlike highways or road networks where capacity is
disaggregated into unlinked trips over individual route segments, railway capacity is fundamentally
considered a network system. As a result, many components are causes and effects of
system disruptions. Maintenance must acknowledge the vast array of a route’s performance (type
of train service, origination/destination, seasonal impacts), line’s capacity (length,
terrain, number of tracks, types of train control), trains throughput (max speeds, acceleration/deceleration
rates), and service features with shared passenger-freight tracks (sidings, terminal capacities, switching
routes, and design type).==Social, economical, and energetic aspects
=====
Energy===Rail transport is an energy-efficient but
capital-intensive means of mechanized land transport. The tracks provide smooth and hard
surfaces on which the wheels of the train can roll with a relatively low level of friction
being generated. Moving a vehicle on and/or through a medium (land, sea, or air) requires
that it overcomes resistance to its motion caused by friction. A land vehicle’s total
resistance (in pounds or Newtons) is a quadratic function of the vehicle’s speed: R
=a
+ b
v +
c v 2 {\displaystyle \qquad \qquad R=a+bv+cv^{2}}
where: R denotes total resistance
a denotes initial constant resistance b denotes velocity-related constant
c denotes constant that is function of shape, frontal area, and sides of vehicle
v denotes velocity v2 denotes velocity, squaredEssentially, resistance
differs between vehicle’s contact point and surface of roadway. Metal wheels on metal
rails have a significant advantage of overcoming resistance compared to rubber-tyred wheels
on any road surface (railway – 0.001g at 10 miles per hour (16 km/h) and 0.024g at
60 miles per hour (97 km/h); truck – 0.009g at 10 miles per hour (16 km/h) and 0.090 at
60 miles per hour (97 km/h)). In terms of cargo capacity combining speed and size being
moved in a day: human – can carry 100 pounds (45 kg) for
20 miles (32 km) per day, or 1 tmi/day (1.5 tkm/day)
horse and wheelbarrow – can carry 4 tmi/day (5.8 tkm/day)
horse cart on good pavement – can carry 10 tmi/day (14 tkm/day)
fully utility truck – can carry 20,000 tmi/day (29,000 tkm/day)
long-haul train – can carry 500,000 tmi/day (730,000 tkm/day) Most trains take 250–400
trucks off the road, thus making the road more safe.In terms of the horsepower to weight
ratio, a slow-moving barge requires 0.2 horsepower per short ton (0.16 kW/t), a railway and pipeline
requires 2.5 horsepower per short ton (2.1 kW/t), and truck requires 10 horsepower per
short ton (8.2 kW/t). However, at higher speeds, a railway overcomes the barge and proves most
economical.As an example, a typical modern wagon can hold up to 113 tonnes (125 short
tons) of freight on two four-wheel bogies. The track distributes the weight of the train
evenly, allowing significantly greater loads per axle and wheel than in road transport,
leading to less wear and tear on the permanent way. This can save energy compared with other
forms of transport, such as road transport, which depends on the friction between rubber
tyres and the road. Trains have a small frontal area in relation to the load they are carrying,
which reduces air resistance and thus energy usage.
In addition, the presence of track guiding the wheels allows for very long trains to
be pulled by one or a few engines and driven by a single operator, even around curves,
which allows for economies of scale in both manpower and energy use; by contrast, in road
transport, more than two articulations causes fishtailing and makes the vehicle unsafe.====Energy efficiency====Considering only the energy spent to move
the means of transport, and using the example of the urban area of Lisbon, electric trains
seem to be on average 20 times more efficient than automobiles for transportation of passengers,
if we consider energy spent per passenger-distance with similar occupation ratios. Considering
an automobile with a consumption of around 6 l/100 km (47 mpg‑imp; 39 mpg‑US) of
fuel, the average car in Europe has an occupancy of around 1.2 passengers per automobile (occupation
ratio around 24%) and that one litre of fuel amounts to about 8.8 kWh (32 MJ), equating
to an average of 441 Wh (1,590 kJ) per passenger-km. This compares to a modern train with an average
occupancy of 20% and a consumption of about 8.5 kW⋅h/km (31 MJ/km; 13.7 kW⋅h/mi),
equating to 21.5 Wh (77 kJ) per passenger-km, 20 times less than the automobile.===Usage===
Due to these benefits, rail transport is a major form of passenger and freight transport
in many countries. It is ubiquitous in Europe, with an integrated network covering virtually
the whole continent. In India, China, South Korea and Japan, many millions use trains
as regular transport. In North America, freight rail transport is widespread and heavily used,
but intercity passenger rail transport is relatively scarce outside the Northeast Corridor,
due to increased preference of other modes, particularly automobiles and airplanes.
South Africa, northern Africa and Argentina have extensive rail networks, but some railways
elsewhere in Africa and South America are isolated lines. Australia has a generally
sparse network befitting its population density but has some areas with significant networks,
especially in the southeast. In addition to the previously existing east-west transcontinental
line in Australia, a line from north to south has been constructed. The highest railway
in the world is the line to Lhasa, in Tibet, partly running over permafrost territory.
Western Europe has the highest railway density in the world and many individual trains there
operate through several countries despite technical and organizational differences in
each national network.===Social and economic benefits=======
Modernization====Railways are central to the formation of modernity
and ideas of progress. The process of modernization in the 19th century involved a transition
from a spatially oriented world to a time oriented world. Exact time was essential,
and everyone had to know what the time was, resulting in clocks towers for railway stations,
clocks in public places, pocket watches for railway workers and for travelers. Trains
left on time (they never left early). By contrast, in the premodern era, passenger ships left
when the captain had enough passengers. In the premodern era, local time was set at noon,
when the sun was at its highest. Every place east to west had a different time and that
changed with the introduction of standard time zones. Printed time tables were a convenience
for the travelers, but more elaborate time tables, called train orders, were even more
essential for the train crews, the maintenance workers, the station personnel, and for the
repair and maintenance crews, who knew when to expect a train would come along. Most trackage
was single track, with sidings and signals to allow lower priority trains to be sidetracked.
Schedules told everyone what to do, where to be, and exactly when. If bad weather disrupted
the system, telegraphers relayed immediate corrections and updates throughout the system.
Just as railways as business organizations created the standards and models for modern
big business, so too the railway timetable was adapted to myriad uses, such as schedules
for buses ferries, and airplanes, for radio and television programs, for school schedules,
for factory time clocks. The modern world was ruled by the clock and the timetable.====Model of corporate management====
According to historian Henry Adams the system of railroads needed: the energies of a generation, for it required
all the new machinery to be created – capital, banks, mines, furnaces, shops, power-houses,
technical knowledge, mechanical population, together with a steady remodelling of social
and political habits, ideas, and institutions to fit the new scale and suit the new conditions.
The generation between 1865 and 1895 was already mortgaged to the railways, and no one knew
it better than the generation itself.The impact can be examined through five aspects: shipping,
finance, management, careers, and popular reaction.=====Shipping freight and passengers=====
First they provided a highly efficient network for shipping freight and passengers across
a large national market. The result was a transforming impact on most sectors of the
economy including manufacturing, retail and wholesale, agriculture, and finance. The United
States now had an integrated national market practically the size of Europe, with no internal
barriers or tariffs, all supported by a common language, and financial system and a common
legal system.=====Basis of the private financial system
=====Railroads financing provided the basis for
a dramatic expansion of the private (non-governmental) financial system. Construction of railroads
was far more expensive than factories. In 1860, the combined total of railroad stocks
and bonds was $1.8 billion; 1897 it reached $10.6 billion (compared to a total national
debt of $1.2 billion). Funding came from financiers throughout the
Northeast, and from Europe, especially Britain. About 10 percent of the funding came from
the government, especially in the form of land grants that could be realized when a
certain amount of trackage was opened. The emerging American financial system was based
on railroad bonds. New York by 1860 was the dominant financial market. The British invested
heavily in railroads around the world, but nowhere more so than the United States; The
total came to about $3 billion by 1914. In 1914–1917, they liquidated their American
assets to pay for war supplies.=====Inventing modern management=====
Railroad management designed complex systems that could handle far more complicated simultaneous
relationships than could be dreamed of by the local factory owner who could patrol every
part of his own factory in a matter of hours. Civil engineers became the senior management
of railroads. The leading American innovators were the Western Railroad of Massachusetts
and the Baltimore and Ohio Railroad in the 1840s, the Erie in the 1850s and the Pennsylvania
in the 1860s.=====Career paths=====
The railroads invented the career path in the private sector for both blue-collar workers
and white-collar workers. Railroading became a lifetime career for young men; women were
almost never hired. A typical career path would see a young man hired at age 18 as a
shop laborer, be promoted to skilled mechanic at age 24, brakemen at 25, freight conductor
at 27, and passenger conductor at age 57. White-collar careers paths likewise were delineated.
Educated young men started in clerical or statistical work and moved up to station agents
or bureaucrats at the divisional or central headquarters. At each level they had more
and more knowledge, experience, and human capital. They were very hard to replace, and
were virtually guaranteed permanent jobs and provided with insurance and medical care.
Hiring, firing, and wage rates were set not by foremen, but by central administrators,
in order to minimize favoritism and personality conflicts. Everything was done by the book,
whereby an increasingly complex set of rules dictated to everyone exactly what should be
done in every circumstance, and exactly what their rank and pay would be. By the 1880s
the career railroaders were retiring, and pension systems were invented for them.====Transportation====
Railways contribute to social vibrancy and economic competitiveness by transporting multitudes
of customers and workers to city centres and inner suburbs. Hong Kong has recognized rail
as “the backbone of the public transit system” and as such developed their franchised bus
system and road infrastructure in comprehensive alignment with their rail services. China’s
large cities such as Beijing, Shanghai, and Guangzhou recognize rail transit lines as
the framework and bus lines as the main body to their metropolitan transportation systems.
The Japanese Shinkansen was built to meet the growing traffic demand in the “heart of
Japan’s industry and economy” situated on the Tokyo-Kobe line.====Wartime roles and air targets====In the 1863-70 decade the heavy use of railways
in the American Civil War, and in Germany’s wars against Austria and France, provided
a speed of movement unheard-of in the days of horses. During much of the 20th century,
rail was a key element of war plans for rapid military mobilization, allowing for the quick
and efficient transport of large numbers of reservists to their mustering-points, and
infantry soldiers to the front lines. The Western Front in France during World War I
required many trainloads of munitions a day. Rail yards and bridges in Germany and occupied
France were major targets of Allied air power in World War II. However, by the 21st century,
rail transport – limited to locations on the same continent, and vulnerable to air
attack – had largely been displaced by the adoption of aerial transport.====Negative impacts====
Railways channel growth towards dense city agglomerations and along their arteries, as
opposed to highway expansion, indicative of the U.S. transportation policy, which encourages
development of suburbs at the periphery, contributing to increased vehicle miles travelled, carbon
emissions, development of greenfield spaces, and depletion of natural reserves. These arrangements
revalue city spaces, local taxes, housing values, and promotion of mixed use development.The
construction of the first railway of the Austro-Hungarian empire, from Vienna to Prague, came in 1837-1842
to promises of new prosperity. Construction proved more costly than anticipated, and it
brought in less revenue because local industry did not have a national market. In town after
town the arrival of railway angered the locals because of the noise, smell, and pollution
caused by the trains and the damage to homes and the surrounding land caused by the engine’s
soot and fiery embers. Almost all travel was local; ordinary people seldom had need of
passenger trains.===Pollution===
A 2018 study found that the opening of the Beijing Metro caused a reduction in “most
of the air pollutants concentrations (PM2.5, PM10, SO2, NO2, and CO) but had little effect
on ozone pollution.”===
Modern rail as economic development indicator===
European development economists have argued that the existence of modern rail infrastructure
is a significant indicator of a country’s economic advancement: this perspective is
illustrated notably through the Basic Rail Transportation Infrastructure Index (known
as BRTI Index).===Subsidies=======Asia=========China=====
In 2014, total rail spending by China was $130 billion and is likely to remain at a
similar rate for the rest of the country’s next Five Year Period (2016–2020).=====India=====
The Indian railways are subsidized by around ₹400 billion (US$5.8 billion), of which
around 60% goes to commuter rail and short-haul trips. It is the fourth largest railway network
in the world comprising 119,630 kilometres (74,330 miles) of total track and 92,081 km
(57,216 mi) of running track over a route of 66,687 km (41,437 mi) with 7,216 stations
at the end of 2015–16.====Europe====According to the 2017 European Railway Performance
Index for intensity of use, quality of service and safety performance, the top tier European
national rail systems consists of Switzerland, Denmark, Finland, ­Germany, Austria, Sweden,
and France. Performance levels reveal a positive correlation between public cost and a given
railway system’s performance, and also reveal differences in the value that countries receive
in return for their public cost. Denmark, Finland, France, Germany, the Netherlands,
Sweden, and Switzerland capture relatively high value for their money, while Luxembourg,
Belgium, Latvia, Slovakia, Portugal, Romania, and Bulgaria underperform relative to the
average ratio of performance to cost among European countries.=====Russia=====
In 2016 Russian Railways received 94.9 billion roubles (around US$1.4 billion) from the government.====North America=========
United States=====Current subsidies for Amtrak (passenger rail)
are around $1.4 billion. The rail freight industry does not receive subsidies.==See also

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