subway, also called underground, tube, or métro, underground railway system used to transport large numbers of passengers within urban and suburban areas.
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Each region has a name for their transportation system, so it varies. For New York, I have mostly seen subway, for DC it's metro, for Boston and Pittsburgh it's the T, for Chicago it's the L. In terms of strict dictionary definitions, both terms imply underground trains.
In America the first metro was built in New York, and it was called SUBWAY because it was built mostly under the streets (sub= under / way= road), since Manhattan street plan is quite a regular grill and it was easy to do so. But most everywhere else they usually call it simply the TRAIN.
The system is operated by a subsidiary of the Metropolitan Transportation Authority (MTA). The subway system is usually just referred to as the trains. Locals say I can take the train to your place to generally mean that they take the subway. The subway is never referred to as the metro, underground, or tube.
The Tremont Street subway in Boston's MBTA subway system is the oldest subway tunnel in North America and the third oldest still in use worldwide to exclusively use electric traction (after the City and South London Railway in 1890, and the Budapest Metro's Line 1 in 1896), opening on September 1, 1897.
The New York Subway opened in 1904 and is the State's longest metro system and one of the world's largest underground lines. It has nearly 500 stations and a total of 660 miles of tracks (1,060 km).
They are the same: electric multiple-unit rapid transit trains. Metro train can run in subways (tunnels), at grade level, or on elevated trackways—referred to as el's in North America. Metro systems are thus frequently referred to as the subway or the underground, the el, or just the train.
Metro is an abbreviation for the word Metropolitan. When used in conjunction with transportation it can mean anything from a bus line, train system, thoroughfare, subway, etc. It is simply a local preference in vernacular. A subway denotes under such as the NYC subway system or under passes in Los Angeles.