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Looks like a slanted Peignot to me. Vector logo of RATP is freely available to download here.
Given the French attitude that French design is number one, I expect that a French company would look at French fonts as the inspiration for their logo.
Et voila! RATP looks almost identical, except for the tip on the A, to a horizontally stretched version of Chambord Medium Italic, by Roger Excoffon. Chambord was released in several weights and Italic by the Fonderie Olive in 1945-51. As far as I know Chambord has not been digitized. For a full alphabet specimen see
Jaspert's Encylopedia of Type Faces, 1970, at p. 259.
Chambord or Peignot? That is the question. Both appeared at about the same time and the uppercase is virtually identical. Chambord had an italic, Peignot did not. Peignot had a pointed A, Chambord did not. On balance, I believe RATP used the Chambord Italic and adjusted it to have a pointed A.
There was a dispute about the status of the two fonts. For a brief discussion see http://typophile.com/node/75590.
That's exactly what Don explained plus a global touch of laziness and lack of inspiration to me. I'm pretty convince they started with Peignot Demi and somebody brilliantly suggested to shear it, mainly to evoke 'speed'. And as it was probably not enough speedy for everybody, they also stretched it, an all-time classic design gimmick of the 90's (RATP logo is from 1992).