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Subway
Subway
Subway.
Subway.
The subway,underground,metro, depending which country you are in
The Tube.
The usual name is a subway.
The "U-Bahn" is the subway that is entirely underground.The "S-Bahn" is the local railway system that is underground in the city centre, but above ground in the suburbs.
subway
'le métro' is the name for the underground / subway transportation in Paris.
The 'sub' part would most likely stand for subterranean, meaning underground. So basically the name means an underground railway.
It's a small passage