line 13 transformed in the middle of the 1970s as a result of its junction with the old line 14, and a more modern and better performing train set, mf 67, was put in service. beginning 28 april 1975, the old ma 51 train sets of line 13, numbering 52 in total, were progressively transferred to line 10 and drastically modernized. the cars were repainted, their outer bodies and seats replaced, and modern fluorescent lighting installed. they circulated in permanent sets of six. by june 1976, all of the trains had been transferred to line 10 and put into service, where they eventually ended their career. in order to reform the old sprague models and because of an insufficient number of trainsets, some mf 67 train sets of the a/d model were placed on line 10 as well. the ma 1951 model was introduced between 1988 and 1994, and afterwards were replaced by mf 67 series e models coming from line 7bis.