![]() ![]() Unlike buses or trams, rapid transit systems are railways, usually electric, that operate on an exclusive right-of-way, which cannot be accessed by pedestrians or other vehicles. A rapid transit system that primarily or traditionally runs below the surface may be called a subway, tube, or underground. Rapid transit or mass rapid transit ( MRT), also known as heavy rail or metro, is a type of high-capacity public transport that is generally found in urban areas. Countries shown in yellow have at least one metro system under construction. Countries shown in green have at least one operational metro system.
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