ALBUQUERQUE, N.M. (AP) — Federal regulators have certified that the New Mexico Rail Runner Express has met a year-end deadline to install a federally required safety system on the state-owned passenger service. The Positive Train Control System is designed to prevent train collisions, high-speed derailments and incursions into track work zones. The passenger service’s operator, the Rio Metro Regional Transit District, began installing the $60 million system on the 100-mile route between Santa Fe and Belen south of Albuquerque in April 2019. In addition to Rail Runner commuter trains, the route is also used by Amtrak long-distance passenger trains and Burlington Northern Santa Fe freight trains.