Rail traffic is a kind of vehicle or transport system that the operating vehicle needs to travel on a specific track. The most typical rail transit is a railway system composed of traditional trains and standard railways. With the diversified development of trains and railway technology, rail transit is showing more and more types, not only in the land transport over long distances but also in urban public transport in short and medium distances.
Common Rail Transit Railway (traditional national railways, intercity rail and city railway), subway, light rail and tram, new rail transit maglev system, monorail system (straddle type rail system and suspension system) and automatic passenger transit system etc.
In China national standard 《the urban public traffic of commonly used terms》, urban rail transit is defined as "usually powered by electricity, wheel/rail operation ways of the floorboard of the rapid mass public transportation.
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