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Rail transport is a means of on wheeled vehicles running on rails, also known as tracks. It is also commonly referred to as transport. In contrast to , where vehicles run on a prepared flat surface, rail vehicles () are directionally guided by the tracks on which they run. Tracks usually consist of rails, installed on (sleepers) and , on which the rolling stock, usually fitted with metal wheels, moves. Other variations are also possible, such as slab track, where the rails are fastened to a concrete foundation resting on a prepared subsurface.

Rolling stock in a rail transport system generally encounters lower than road vehicles, so passenger and freight cars (carriages and wagons) can be coupled into longer trains. The operation is carried out by a , providing transport between or freight customer facilities. Power is provided by which either draw from a railway electrification system or produce their own power, usually by . Most tracks are accompanied by a signalling system. Railways are a safe land transport system when compared to other forms of transport.According to this source , railways are the safest on both a per-mile and per-hour basis, whereas is safe only on a per-mile basis 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 , . Rail transport then commenced in mid 16th century in in form of horse-powered and . Modern rail transport commenced with the British development of the 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 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 , and allowed for fewer lost goods, compared with water transport, which faced occasional sinking of ships. The change from 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 replaced by -electric locomotives, with the process being almost complete by the 2000s. During the 1960s, electrified were introduced in and later in some other countries. Many countries are in process of replacing diesel locomotives with electric locomotives, mainly due to environmental concerns, a notable example being , which has completely electrified its network. Other forms of guided ground transport outside the traditional railway definitions, such as or , have been tried but have seen limited use.

Following decline after World War II due to competition from cars, rail transport has had a revival in recent decades due to road congestion and rising fuel prices, as well as governments as a means of reducing CO2 emissions in the context of concerns about .


History
The history of rail transport began in the 6th century BC in . 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 paved trackway, which transported boats across the Isthmus of Corinth in from around 600 BC.Verdelis, Nikolaos: "Le diolkos de L'Isthme", Bulletin de Correspondance Hellénique, Vol. 81 (1957), pp. 526–529 (526)Cook, R. M.: "Archaic Greek Trade: Three Conjectures 1. The Diolkos", The Journal of Hellenic Studies, Vol. 99 (1979), pp. 152–155 (152)Drijvers, J.W.: "Strabo VIII 2,1 (C335): Porthmeia and the Diolkos", Mnemosyne, Vol. 45 (1992), pp. 75–76 (75) & Tolley, M.: "Le Diolkos de l’Isthme à Corinthe: son tracé, son fonctionnement", Bulletin de Correspondance Hellénique, Vol. 117 (1993), pp. 233–261 (256)Lewis, M. J. T., "Railways in the Greek and Roman world" , in Guy, A. / Rees, J. (eds), Early Railways. A Selection of Papers from the First International Early Railways Conference (2001), pp. 8–19 (11) Wheeled vehicles pulled by men and animals ran in grooves in , 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 .


Pre-steam

Wooden rails introduced
Railways reappeared again only in the 14th century.

In 1515, Cardinal Matthäus Lang wrote a description of the , a railway at the Hohensalzburg Castle in Austria. The line originally used wooden rails and a haulage rope and was operated by human or animal power, through a . The line still exists and is operational, although in updated form and is possibly the oldest operational railway.

(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 very popular in Europe. Such an operation was illustrated in Germany in 1556 by Georgius Agricola (image right) in his work De re metallica.Georgius Agricola (trans Hoover), De re metallica (1913), p. 156. 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.Lewis, Early wooden railways, pp. 8–10. Such a transport system was later used by German miners at , , England, perhaps from the 1560s.Warren Allison, Samuel Murphy and Richard Smith, An Early Railway in the German Mines of Caldbeck in G. Boyes (ed.), Early Railways 4: Papers from the 4th International Early Railways Conference 2008 (Six Martlets, Sudbury, 2010), pp. 52–69. A wagonway was built at , near , 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.

(2018). 9781846742989, Countryside Books.
A funicular railway was also made at in some time before 1604. This carried coal for James Clifford from his mines down to the to be loaded onto barges and carried to riverside towns.Peter King, The First Shropshire Railways in G. Boyes (ed.), Early Railways 4: Papers from the 4th International Early Railways Conference 2008 (Six Martlets, Sudbury, 2010), pp. 70–84. The Wollaton Wagonway, completed in 1604 by Huntingdon Beaumont, has sometimes erroneously been cited as the earliest British railway. It ran from Strelley to near .

The Middleton Railway in , 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 America was built in Lewiston, New York.

(2018). 9780665783470, The Author.


Metal rails introduced
In the late 1760s, the Company began to fix plates of to the upper surface of the wooden rails. This allowed a variation of to be used. At first only could be used for turning, but later, movable points were taken into use that allowed for switching.
(1997). 9780719557460, John Murray.

A system was introduced in which unflanged wheels ran on L-shaped metal plates – these became known as . , 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 for wagonways serving his canals, manufacturing them at his Butterley ironworks. In 1803, opened the Surrey Iron Railway, a double track plateway, erroneously sometimes cited as world's first public railway, in south London.

Meanwhile, had earlier used a form of all-iron and flanged wheels successfully for an extension to the Charnwood Forest Canal at , , 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 on 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 invented by in 1820 replaced cast 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 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.

(1969). 9780521094184, Press Syndicate of the University of Cambridge.
These processes greatly lowered the cost of producing iron and rails. The next important development in iron production was 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 , 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.

(1891). 9780543724748, D. Appleton and Co.. .
(1964). 9780801811487, The Johns Hopkins Press.
Steel rails made heavier locomotives possible, allowing for longer trains and improving the productivity of railroads.
(1982). 9780521273671, Cambridge University Press.
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, thus becoming standard for all railways.

The first passenger or , Swansea and Mumbles Railway was opened between and in in 1807. Horses remained the preferable mode for tram transport even after the arrival of steam engines, well till the end of the 19th century. The major reason was that the horse-cars were cleaner compared to steam driven trams which caused smoke in city streets.


Steam power introduced
, a Scottish inventor and mechanical engineer, greatly improved the of , hitherto used to pump water out of mines. Watt developed a reciprocating engine in 1769, capable of powering a wheel. Although the Watt engine powered cotton mills and a variety of machinery, it was a large stationary engine. It could not be otherwise: the state of boiler technology necessitated the use of low pressure steam acting upon a vacuum in the cylinder; this required a separate condenser and an . Nevertheless, as the construction of boilers improved, Watt investigated the use of high-pressure steam acting directly upon a piston. This raised the possibility of a smaller engine, that might be used to power a vehicle and he patented a design for a in 1784. His employee produced a working model of a self-propelled steam carriage in that year.

The first full-scale working railway was built in the United Kingdom in 1804 by Richard Trevithick, a British engineer born in . This used high-pressure steam to drive the engine by one power stroke. The transmission system employed a large to even out the action of the piston rod. On 21 February 1804, the world's first steam-powered railway journey in the world took place when Trevithick's unnamed steam locomotive hauled a train along the tramway of the ironworks, near in . Trevithick later demonstrated a locomotive operating upon a piece of circular rail track in , 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 's locomotive built for the Middleton Railway in in 1812. This twin-cylinder locomotive was not heavy enough to break the track and solved the problem of by a using teeth cast on the side of one of the rails. Thus it was also the first .

This was followed in 1813 by the locomotive Puffing Billy built by Christopher Blackett and for the Colliery Railway, the first successful locomotive running by 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 where he worked to allow him to build a 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 -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 . 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 in Scotland, and it was powered by (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 , 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 kilometers). 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.
(1966). 9780415060424, Routledge.
Renzo Pocaterra, Treni, De Agostini, 2003

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 , 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 and the line was extended to Berlin-Lichterfelde West station. The Volk's Electric Railway opened in 1883 in , 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 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 stretch 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 system in 1890 on the City and South London Railway, now part of the London Underground . 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 , to 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 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 motors and, because of the absence of a commutator, were simpler to manufacture and maintain.Heilmann evaluated both AC and DC electric transmission for his locomotives, but eventually settled on a design based on 's DC system — Duffy (2003), p.39–41 However, they were much larger than the DC motors of the time and could not be mounted in underfloor : 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.

(1998). 9780966573428, Simon Publications LLC. .
(1977). 9780912404042, Alpha Publications.

In 1896, Oerlikon installed the first commercial example of the system on the Lugano Tramway. Each 30-tonne locomotive had two 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 just a short stretch. The 106 km 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,
(2018). 9780852968055, IET. .
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 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 two axle machine built by Priestman Brothers was used on the .

In 1906, , 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.

(1993). 9783344707675, Transpress.
Small numbers of prototype diesel locomotives were produced in a number of countries through the mid-1920s.

A significant breakthrough occurred in 1914, when , a electrical engineer, developed and patented a reliable electrical control system (subsequent improvements were also patented by Lemp).Lemp, Hermann. U.S. Patent No. 1,154,785, filed April 8, 1914, and issued September 28, 1915. Accessed via Google Patent Search at: US Patent #1,154,785 on February 8, 2007. Lemp's design used a single lever to control both engine and generator in a coordinated fashion, and was the 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 Sulzer AG. They were classified as DET 1 and DET 2 (). The first regular use of diesel–electric locomotives was in (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 Tōkaidō Shinkansen was introduced in 1964 between and in Japan. Since then transport, functioning at speeds up 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 , , , and the . 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 tracks of continuously welded rail on 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 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 to haul the weight of the full train. This arrangement remains dominant for freight trains and is often used for passenger trains. A 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 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 is a single, self-powered car, and may be electrically-propelled or powered by a . Multiple units have a driver's cab at each end of the unit, and were developed following the ability to build 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
are locomotives with a that provides adhesion. , , or is burned in a firebox, boiling water in the to create pressurized steam. The steam travels through the before leaving via the chimney or smoke stack. In the process, it powers a that transmits power directly through a (US: main rod) and a (US: wristpin) on the (US main driver) or to a 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 .

Electric locomotives draw power from a stationary source via an or . Some also or instead use a battery. In locomotives that are powered by high voltage alternating current, a in the locomotive converts the high voltage, low current power to low voltage, high current used in the that power the wheels. Modern locomotives may use three-phase AC induction motors or 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 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, , gravity, and .


Passenger trains
InterCity2 double-deck carriage]]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).American Railway Engineering and Maintenance of Way Association Committee 24 – Education and Training. (2003). Practical Guide to Railway Engineering. AREMA, 2nd Ed.

are long-haul trains that operate with few stops between cities. Trains typically have amenities such as a . Some lines also provide over-night services with . Some long-haul trains have been given a specific name. are medium distance trains that connect cities with outlying, surrounding areas, or provide a regional service, making more stops and having lower speeds. serve suburbs of urban areas, providing a daily service. Airport rail links provide quick access from city centres to .

are special inter-city trains that operate at much higher speeds than conventional railways, the limit being regarded at . High-speed trains are used mostly for long-haul service and most systems are in Western Europe and East Asia. The speed record is , set by a modified French . 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. ); 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.

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 can be used. are upgraded trams that have step-free access, their own right-of-way and sometimes sections underground. systems are elevated, medium-capacity systems. A 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 (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 operates large cars on its well-engineered routes.


Freight train

A freight train hauls using 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.

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 (wagon-load), where the cargo had to be loaded and unloaded into the train manually. The intermodal of cargo has revolutionized the industry, reducing ship costs significantly. In Europe, the sliding wall wagon has largely superseded the . Other types of cars include , stock cars for livestock and for road vehicles. When rail is combined with road transport, a will allow 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 much cheaper than by road. Typical bulk cargo includes coal, ore, grains and liquids. Bulk is transported in open-topped cars, and .


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.


Trackage
Track consists of two parallel steel rails, anchored to members called (sleepers) of timber, concrete, steel, or plastic to maintain a consistent distance apart, or . Rail gauges are usually categorized as (used on approximately 54.8% of the world's existing railway lines), , and . In addition to the rail gauge, the tracks will be laid to conform with a 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 to distribute the load from the ties and to prevent the track from 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 without ballast. Track may be prefabricated or assembled in place. By 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 (passenger trains).

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.

, 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 (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
w/ dragging equipment unit]]The inspection of railway equipment is essential for the safe movement of trains. Many types of are in use on the world's railroads. These devices utilize technologies that vary from a simplistic paddle and switch to 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 , a small building that houses the 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.


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 .

Power may be fed as 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 serves as an area where passengers can board and alight from trains. A 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 . 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 , and level crossings. Some large stations are built as , 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 , serve as the main 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 () 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 , 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 revenue (for passenger transport) and shipment fees for cargo. Discounts and monthly passes are sometimes available for frequent travellers (e.g. and ). 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, income can be significant.

Governments may choose to give subsidies to rail operation, since rail transport has fewer 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.

, the US passenger rail service, and Canada's are private railroad companies chartered by their respective national governments. As private passenger services declined because of competition from automobiles and airlines, they became 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 .


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 (jumping the track), a collision with another train or collision with automobiles, other vehicles or pedestrians at . 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 at crossings. , 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 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 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, 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 or 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 ) is a quadratic function of the vehicle's speed:

\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, squared

Essentially, 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 and 0.024g at ; truck – 0.009g at and 0.090 at ). In terms of cargo capacity combining speed and size being moved in a day:

  • human – can carry for 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 , a railway and pipeline requires , and truck requires . However, at higher speeds, a railway overcomes the barge and proves most economical.

As an example, a typical modern wagon can hold up to of freight on two four-wheel . The track distributes the weight of the train evenly, allowing significantly greater loads per 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 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 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 , 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 of fuel, the average car in Europe has an occupancy of around 1.2 passengers per automobile (occupation ratio around 24%) and that amounts to about , equating to an average of per passenger-km. This compares to a modern train with an average occupancy of 20% and a consumption of about , equating to 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 , 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
Railways are central to the formation of modernity and ideas of progress.Schivelbusch, G. (1986) The Railway Journey: Industrialization and Perception of Time and Space in the 19th Century. Oxford: Berg. Railways contribute to social vibrancy and economic competitiveness by transporting multitudes of customers and workers to and . 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.Hong Kong Information Services Department of the Hong Kong SAR Government. Hong Kong 2009 China's large cities such as , , and recognize rail transit lines as the framework and bus lines as the main body to their metropolitan transportation systems.Hau H., Yun-feng G., Zhi-gang, L., Xiao-guang, Y. (2010). Effect of Integrated Multi-Modal Transit Information on Modal Shift. Intelligent Transportation Systems (ITSC), 2010 13th International IEEE Conference. 1753-1757pg. The Japanese was built to meet the growing traffic demand in the "heart of Japan's industry and economy" situated on the - line.Nishida, M., The Shinkansen High-Speed Rail Network of Japan. Proceedings of an IIASA Conference, June 27–30, 1977.

on the way to the front in August 1914. The message on the car reads Von München über Metz nach Paris. (From Munich via Metz to Paris).]] During much of the 20th century, rail was an invaluable element of military , allowing for the quick and efficient transport of large numbers of reservists to their mustering-points, and infantry soldiers to the front lines. 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 .

Railways channel growth towards dense city and along their arteries, as opposed to expansion, indicative of the U.S. transportation policy, which incents development of at the periphery, contributing to increased vehicle miles travelled, , development of spaces, and depletion of . These arrangements revalue city spaces, local , values, and promotion of mixed use development.Squires, G. Ed. (2002) Urban Sprawl: Causes, Consequences, & Policy Responses. The Urban Institute Press.Puentes, R. (2008). A Bridge to Somewhere: Rethinking American Transportation for the 21st Century. Brookings Institution Metropolitan Policy Report: Blueprint for American Prosperity series report.


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 , 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 mi) 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
17.02014
13.22013
8.12009
5.82012
5.12015
4.52015
3.42008
2.52014
2.32009
1.72008
1.62009
1.42008
0.912008


Russia
In total, Russian Roadways receives 90 billion roubles (around US$1,5 billion) annually 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
  • List of rail transport topics
  • List of railroad-related periodicals
  • List of railway companies
  • List of transnational trains
  • List of transnational railways
  • List of railway industry occupations
  • Passenger rail terminology
  • Rail transport by country
  • Rail transport in Walt Disney Parks and Resorts
  • Rail usage statistics by country
  • Railway systems engineering
  • Environmental design in rail transportation
  • International Union of Railways
  • Transport Revolution


Notes

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