rapid transit
US /ˌræp.ɪd ˈtræn.zɪt/
UK /ˌræp.ɪd ˈtræn.zɪt/
1.
a system of public transportation in a city, usually consisting of trains that move quickly on a special track, often underground or above ground on elevated tracks
:
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Many large cities rely on rapid transit systems to move commuters efficiently.
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The new rapid transit line will significantly reduce travel time across the city.