 A total of 15 such vehicles were built, in 1980–1983 (numbered 10–24).Trolleybus service on line M (composed of former lines H and M) ended on 3 November 1984, its trolleybuses being transferred to line K. This left only route K, which was in length, in operation.After a long series of vicissitudes and mismanagement by the private concessionaire, the trolleybuses on the system were declining in quality of service and maintenance.