sentences:  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.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.