Chemin de Fer Métropolitain de la Ville de Paris. But everybody calls it Le MÉTRO.
'le métro' is the name for the underground / subway transportation in Paris.
The underground rail system - what Americans would call a subway system.
Subway
Subway
Subway.
Subway.
The Tube.
The subway,underground,metro, depending which country you are in
The underground is called "le métro" (short for "métropolitain", which isn't used any more) in French. However, outside of Paris, you should clarify by saying "le métro de Paris", especially if you are in a city with a different subterranean train system (subway/metro/underground).
The usual name is a subway.
The le metro is the French underground/ subway train network system. Its centre is Paris and it links the surrounding areas.
An underground way or gallery; especially, a passage under a street, in which water mains, gas mains, telegraph wires, etc., are conducted.