The line 's original fleet consisted of semi-new articulated LRVs built by Moyada ( '' Motores y Adaptaciones Automotrices , S.A. '' ) , incorporating the bogies ( trucks ) and some other parts from STE 's large fleet of withdrawn 1940s-vintage PCC streetcars . ( STE originally intended to rebuild about 20 PCCs for the lines , a project well underway at STE 's Tetepilco Depot when the workshop building collapsed during the 1985 Mexico City earthquake , crushing the cars . ) . The prototype LRV was numbered 000 , and the remainder 001-016 . The Moyada cars had all-new bodies and were equipped with pantographs instead of trolley poles to collect current from the overhead wires . Unlike the old streetcars/trams , they were also bi-directional , having operating cabs at both ends and doors on both sides . Perhaps because of their vintage running gear or electrical components , these cars were found to be unreliable , even after the refurbishment of six in 1989 – 91
1985 Mexico City earthquake
1985 Mexico City earthquake
Xochimilco Light Rail