In America metro is usually short for metropolitan area (a big city and its area of influence). SUMMARY (simplified) = the tube (or the underground) = the subway / the train.
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subway, also called underground, tube, or métro, underground railway system used to transport large numbers of passengers within urban and suburban areas. Subways are usually built under city streets for ease of construction, but they may take shortcuts and sometimes must pass under rivers.
The London Underground (also known simply as the Underground or by its nickname the Tube) is a rapid transit system serving Greater London and some parts of the adjacent home counties of Buckinghamshire, Essex and Hertfordshire in England.
The majority of that network is owned and operated by freight rail enterprises. Amtrak, the federally chartered U.S. passenger railroad operator, runs on 21,400 miles of track, nearly three-quarters of which is leased from private companies.
The Metropolitan line is the oldest underground railway in the world. The Metropolitan Railway opened in January 1863 and was an immediate success, though its construction took nearly two years and caused huge disruption in the streets.
Since then the Underground network, affectionately nicknamed the Tube by generations of Londoners, has grown to 272 stations and 11 lines stretching deep into the Capital's suburbs and beyond.
The deepest station is Hampstead on the Northern line, which runs down to 58.5 metres. 15. In Central London the deepest station below street level is also the Northern line.
The Central line is a London Underground line that runs through central London, from Epping, Essex, in the north-east to Ealing Broadway and West Ruislip in west London. Printed in red on the Tube map, the line serves 49 stations over 46 miles (74 km), making it the longest line on the Underground.
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.