The MP 89 class was developed initially when the need to replace the original rubber-tyred MP 55 cars of Line 11 was identified, and rolling stock was required for the new Line 14 as well as the anticipation of the extension of Line 1 into the La Défense business district. This was to be achieved by the construction of this new class of cars for Lines 1 and 14, with the cascading of refurbished MP 59 stock from Line 1 to lines 11 and 4. Two types were designed, the driverless MP 89 CA for the automated Line 14, and MP 89 CC for the then manually driven line 1. Both subclasses are visually similar except for the provision of a drivers cab in the outer end of the MP 89 CC cars. "(from :fr:MP 89)".