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Rail transport (also known as train transport) is a means of transport using wheeled vehicles running in railway track, which usually consist of two parallel steel railway track. Rail transport is one of the two primary means of land transport, next to road transport. It is used for about 8% of passenger and freight transport globally, thanks to its energy efficiency and potentially high-speed rail.Rolling stock on rails generally encounters lower friction than rubber-tyred road vehicles, allowing rail cars to be coupled into longer . Power is usually provided by diesel or electric . While railway transport is capital-intensive and less flexible than road transport, it can carry heavy loads of passengers and cargo with greater energy efficiency and safety.
Precursors of railways driven by human or animal power, have existed since antiquity, but modern rail transport began with the invention of the steam locomotive in the United Kingdom at the beginning of the 19th century. The first passenger railway, the Stockton and Darlington Railway, opened in 1825. The quick spread of railways throughout Europe and North America, following the 1830 opening of the first intercity connection in England, was a key component of the Industrial Revolution. The adoption of rail transport lowered shipping costs compared to transport by water or wagon, and led to "national markets" in which prices varied less from city to city.Hilton, George W. American Narrow Gauge Railroads, p. 41, Stanford University Press, Stanford, California, 1990.Floyd, Donald R. California Narrow Gauge: The Role of Narrow-Gauge Railroads in California's Transportation Network, pp. 19-20, 22, The Gibson Press, Mountain View, California, 1970.Athearn, Robert G. Rebel of the Rockies: A History of the Denver and Rio Grande Western Railroad, pp. 4-5, 16-25, Yale University Press, New Haven, Connecticut, 1962.Beebe, Lucius and Clegg, Charles. Narrow Gauge in the Rockies, p. 31, Howell-North, Berkeley, California, 1958.Jensen, Oliver. The American Heritage History of Railroads in America, pp. 7, 32, 84, 104, American Heritage Publishing Company, New York, New York, 1975.
Railroads not only increased the speed of transport, they also dramatically lowered its cost. For example, the first transcontinental railroad in the United States resulted in passengers and freight being able to cross the country in a matter of days instead of months and at one tenth the cost of stagecoach or wagon transport. With economical transportation in the West (which had been referred to as the Great American Desert), now farming, ranching and mining could be done at a profit. As a result, railroads transformed the country, particularly the West (which had few navigable rivers).Athearn, Robert G. Rebel of the Rockies: A History of the Denver and Rio Grande Western Railroad, pp. 4-5, 16-25, Yale University Press, New Haven, Connecticut, 1962.Beebe, Lucius and Clegg, Charles. Narrow Gauge in the Rockies, p. 31, Howell-North, Berkeley, California, 1958.Davidson, James West, et al. American Nation: Independence Through 1914, p. 304, Prentice-Hall, Upper Saddle River, New Jersey, 2000. .Blum, John M. et al. The National Experience: A History of the United States, pp. 298-9, Harcourt, Brace & World, Inc., New York, New York, 1963.
In the 1880s, railway electrification began with and rapid transit systems. Starting in the 1940s, steam locomotives were replaced by diesel locomotives. The first high-speed rail was introduced in Japan in 1964, and high-speed rail lines now connect many cities in Europe, East Asia, and the eastern United States. Following some decline 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 rail subsidies as a means of reducing CO2 emissions.
For example, evidence indicates that a 6 to 8.5 km long Diolkos paved trackway transported boats across the Isthmus of Corinth in Greece from around 600 BC. The Diolkos was in use for over 650 years, until at least the 1st century AD. Paved trackways were also later built in Roman Egypt.
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.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 Caldbeck, Cumbria, 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 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 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.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 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.
A system was introduced in which unflanged wheels ran on L-shaped metal plates, which came to be known as . 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.
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.David. S. Landes (1969). 9780521094184, Press Syndicate of the University of Cambridge. ISBN 9780521094184 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 the 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.
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 railway locomotive The 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 Rail 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 Rail 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, and is 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 Coal mining where he worked to allow him to build a Steam engine 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 northeast 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.
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 volts DC, which was supplied by running rails. In 1891 the track was equipped with an Overhead line 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 Tram 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 hydroelectricity at Lauffen am Neckar and Frankfurt am Main West, a distance of . 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 Direct current 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 : 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 Évian-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 motors run by three-phase 750 V 40 Hz fed from double overhead lines. Three-phase motors run at a 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.
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 . Small numbers of prototype diesel locomotives were produced in a number of countries through the mid-1920s. The Soviet Union operated three experimental units of different designs since late 1925, though only one of them (the E el-2) proved technically viable.
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 Switzerland Sulzer AG. They were classified as DET 1 and DET 2 (de.wiki). The first regular used diesel–electric locomotives were switcher (shunter) locomotives. 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.
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 , has been built in Japan, Spain, TGV, 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 separation 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.
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 and other engines small enough to fit under the coach. There are only a few freight multiple units, most of which are high-speed post trains.
Electric locomotives draw power from a stationary source via an overhead lines 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 electric motor 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, funicular, rack railway, gravity, pneumatics and gas turbine.
Inter-city rail 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 . Some long-haul trains have been given a specific name. Regional rail are medium distance trains that connect cities with outlying, surrounding areas, or provide a regional service, making more stops and having lower speeds. Commuter rail serve suburbs of urban areas, providing a daily commuting service. Airport rail links provide quick access from city centres to . High-speed rail 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. Magnetic levitation trains such as the Shanghai maglev 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 broader curves than conventional railways, but may have steeper grades that are more easily climbed by trains with large kinetic energy.
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 and 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 to support trains that can operate safely at higher speeds.
At street level, smaller can be used. Light rail systems use upgraded tram technology that have their own right-of-way and sometimes semi-metro. Monorail systems are elevated, medium-capacity systems. A people mover is a driver-less, grade-separated vehicle that serves only a few stations, often as a shuttle or in a loop. Systems with larger capacity are designated automated guideway transit.
Containerization have become widely used in many places for general freight, particularly in North America, where double stacking reduces costs. Containers can easily be transshipped between other modes, such as ships and trucks, and at breaks of gauge. Containers have 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 shipping costs significantly. In Europe, the sliding wall wagon has largely superseded the Goods van. Other types of cars include , stock cars for livestock and for road vehicles. When rail is combined with road transport, a roadrailer will allow semi-trailer 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 cargo much cheaper than by road. Typical bulk cargo includes coal, ore, grains and liquids. Bulk is transported in open-topped cars, and .
Modern services on rapid transit systems are provided on designated lines between metro station typically using electric multiple units on . Some systems use guided rubber tires, magnetic levitation ( maglev), or monorail. The stations typically have high platforms, without steps inside the trains, requiring custom-made trains in order to minimize gaps between train and platform. They are typically integrated with other public transport and often operated by the same public transport authorities. Some rapid transit systems have at-grade intersections between a rapid transit line and a road or between two rapid transit lines.
The world's first rapid transit system was the partially underground Metropolitan Railway which opened in 1863 using , and now forms part of the London Underground. In 1868, New York opened the elevated West Side and Yonkers Patent Railway, initially a cable-hauled line using stationary steam engines.
, China has the largest number of rapid transit systems in the world40 in number, running on over of trackand was responsible for most of the world's rapid-transit expansion in the 2010s. The world's longest single-operator rapid transit system by route length is the Shanghai Metro. The world's largest single rapid transit service provider by number of stations (472 stations in total) is the New York City Subway. The busiest rapid transit systems in the world by annual ridership are the Shanghai Metro, Tokyo subway, Seoul Metro and the Moscow Metro.
Rail gauges are usually categorized as standard gauge (used on approximately 70% 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 track 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 directly without ballast. Track may be prefabricated or assembled in place. By Thermite 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.
Points and switchesalso known as Railroad switch the means of directing a train onto a diverging section of track. Laid similar to normal track, a point typically consists of a Switch 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.
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.
Power may be fed as direct current (DC) or alternating current (AC). 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 and 25 kV.
Platforms are used to allow easy access to the trains, and are connected to each other via , and . Some large stations are built as cul-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 , serve as the main transport hub for the city, and have transfer available between rail services, and to rapid transit, tram or bus services.
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.
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 privatised, 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 held, and a time-limited contract awarded to the lowest bidder. Total EU rail subsidies amounted to €73 billion in 2005.
Via Rail Canada and US passenger rail service Amtrak are private railroad companies chartered by their respective national governments. As private passenger services declined because of competition from cars and airlines, they became of Amtrak either with a cash entrance fee or relinquishing their locomotives and rolling stock. The government subsidises Amtrak by supplying start-up capital and making up for losses at the end of the fiscal year.
On many high-speed inter-city networks, such as Japan's Shinkansen, the trains run on dedicated railway lines without any level crossings. This is an important element in the safety of the system as it effectively eliminates the potential for collision with automobiles, other vehicles, or pedestrians, and greatly reduces the probability of collision with other trains. Another benefit is that services on the inter-city network remain punctual.
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, specialised equipment or smaller versions of conventional maintenance gear are used.
Unlike highways 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), a 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).
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 axle and wheel than in road transport, leading to greater energy efficiency. Trains have a smaller 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.
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 Qingzang railway, 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.
The invention of the electrical telegraph in the early 19th century also was crucial for the development and operation of railroad networks. If bad weather disrupted the system, telegraphers relayed immediate corrections and updates throughout the system. Additionally, most railroads were single-track, with passing loop and signals to allow lower priority trains to be sidetracked and have scheduled meets.
Funding came from financiers in the Northeastern United States and from Europe, especially Britain. About 10 percent of the funding came from the government, particularly in the form of land grants that were realized upon completion of a certain amount of trackage.Kirkland, Industry comes of age (1961) pp. 57–68. The emerging American financial system was based on railroad bonds, and by 1860, New York was the dominant financial market. The British invested heavily in railroads around the world, but nowhere more than in the United States; the total bond value reached about $3 billion by 1914. However, in 1914–1917, the British liquidated their American assets to pay for war supplies.Saul Engelbourg, The man who found the money: John Stewart Kennedy and the financing of the western railroads (1996).
Hiring, firing, and wage rates were set not by foremen, but by central administrators, to minimize favouritism 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, career railroaders began retiring, and pension systems were invented for them.Walter Licht (1983). 9780691047003, Princeton, N.J. : Princeton University Press. . ISBN 9780691047003
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| 5.8 | 2012 | |
| 5.1 | 2015 | |
| 4.5 | 2015 | |
| 3.4 | 2008 | |
| 2.5 | 2014 | |
| 2.3 | 2009 | |
| 1.7 | 2008 | |
| 1.6 | 2009 | |
| 1.4 | 2008 | |
| 0.91 | 2008 |
|
|
