A rapid transit, metro, subway, underground, or elevated railway system is an electric passenger railway in an urban area with high capacity and frequency, and which is grade separated from other traffic. Rapid transit systems are typically either in underground tunnels or elevated above street level. Outside urban centres, rapid transit lines sometimes run grade separated at ground level. Some systems use different types in different areas.
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A rapid transit, metro, subway, underground, or elevated railway system is an electric passenger railway in an urban area with high capacity and frequency, and which is grade separated from other traffic. Rapid transit systems are typically either in underground tunnels or elevated above street level. Outside urban centres, rapid transit lines sometimes run grade separated at ground level. Some systems use different types in different areas.
Service on rapid transit systems is provided on designated lines between stations using electric multiple units on rails, although some systems use magnetic levitation or monorails. They are typically integrated with other public transport and often operated by the same public transit authorities. Rapid transit is faster and has a higher capacity than trams or light rail, but is not as fast or as far-reaching as commuter rail. It is unchallenged in its ability to transport large numbers of people quickly over short distances with little land use....
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