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Rail

​Rail transport (also known as train transport) is a means of transport using wheeled vehicles running in tracks, which usually consist of two parallel steel rails.[1] 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,[2] thanks to its energy efficiency[2] and potentially high speed.

Rolling stock on rails generally encounters lower frictional resistance than rubber-tyred road vehicles, allowing rail cars to be coupled into longer trains. Power is usually provided by diesel or electrical locomotives. 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.[a]

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 water transport, leading to "national markets" in which prices varied less from city to city.

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