Federally-mandated positive train control work to prevent train collisions and overspeed derailments on Boston-area commuter rail lines is progressing ahead of schedule, according to the Massachusetts Bay Transportation Authority.
This is critical work for the MBTA, which is leading the nation in derailments with seven MBTA Green Line derailments in 2015 and six on Green Line trolleys in 2016, but no injuries or delays. The MBTA reports no mainline derailments have occurred since Nov. 2016.