Subway vs. Metro — What's the Difference?

An underground urban railroad, usually operated by electricity.

(general) A rapid transit rail transport system, or a train in such systems, generally underground and serving a metropolitan area.

A passage for such a railroad.

(less common) An urban rapid transit rail transport system, normally with lighter track and light trains (i.e. an S-Bahn or similar), or a train in such systems.

An underground tunnel or passage, as for a water main or for pedestrians.

A metropolitan area.

An underground railway, especially for mass transit of people in urban areas. Rail transportation

Metropolitan

A train that runs on such an underground railway.

Electric underground railway

A rapid transit system, regardless of the elevation of its right of way; a metro system.

(British) An underground walkway, tunnel for pedestrians (called pedestrian underpass in US).

An underground route for pipes, sewers, etc.

To travel by underground railway.

An underground way or gallery; especially, a passage under a street, in which water mains, gas mains, telegraph wires, etc., are conducted.

An underground railroad, usually having trains powered by electricity provided by an electric line running through the underground tunnel. It is usually confined to the center portion of cities; - called also tube, and in Britain, underground. In certain other countries (as in France or Russia) it is called the metro.

Electric underground railway

An underground tunnel or passage enabling pedestrians to cross a road or railway