The company's post-war successor, RATP, revived the scheme in the 1950s, and in 1960 an interministerial committee decided to go ahead with the construction of an east-west line.
Succesorul postbelic al CMP, RATP, a revitalizat proiectul, iar în anii 1950 și 1960 un comitet interministerial a decis construirea unei prime linii est-vest.