September 28, 1990 marked the approval of the contract to manufacture the MP 89 trains by RATP for an order of 665 cars, with GEC- Alsthom being selected as the manufacturer. In 1994, a prototype MP 89 CA was built for testing at a facility near the "Petite Ceinture", the former rail line that encircled Paris. A total of 52 trains for Line 1 and 21 trains for Line 14 were built, totaling 438 cars, fewer than the 665 cars mentioned in the contract. The first MP 89 CC trains went into service on Line 1 on March 27, 1997 and the MP 89 CA trains went into service on Line 14 on October 15, 1998.