Hearst investigation: Lifesaving rail technology deadline nears FacebookTwitterEmail An express train speeds through the Greenwich Metro-North station in Greenwich, Conn. Wednesday, June 10, 2020.Tyler Sizemore / Hearst Connecticut Media Two deadly train collisions in Connecticut could have been avoided if railway technology now required on commuter lines existed at the time, federal authorities say. The Federal Railroad Administration documented two rail accidents in the state in the past 50 years that could have been prevented if automatic braking technology called positive train control were implemented at the time — one in Darien in 1969 on Penn Central rails and another in New Canaan in 1976 on Conrail.