Rapid transit

The Moscow Metro is one of the busiest metro systems in the world and is the busiest in Europe.

A Metro 7000 Series train in the District of Columbia.

Initial construction stages of London's Metropolitan Railway at King's Cross St. Pancras in 1861

Rapid transit, also known as metro, subway or underground is a type of high-capacity public transport generally found in urban areas. Unlike buses or trams, rapid transit systems are electric railways that operate on an exclusive right-of-way, which cannot be accessed by pedestrians or other vehicles of any sort, and which is often grade separated in tunnels or on elevated railways.

单词	Rail rapid transit
释义	Rail rapid transit 英语百科 Rapid transit Rapid transit, also known as metro, subway or underground is a type of high-capacity public transport generally found in urban areas. Unlike buses or trams, rapid transit systems are electric railways that operate on an exclusive right-of-way, which cannot be accessed by pedestrians or other vehicles of any sort, and which is often grade separated in tunnels or on elevated railways.
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Rail rapid transit

Rapid transit