Métropolitain

The Métropolitain was an underground railway that serviced at least Paris, France. The Fourth Doctor and Romana II used it when they visited the city in 1979. Stations at this time included Nation, Charles de Gaulle–Étoile, and Trocadéro. (TV: )

Behind the scenes
Though not identified in dialogues, clear signage for the Metropolitan can be seen at several points in the location filming for episode 1.