Allegheny County Police officers have identified the Beaver County man who was killed when he was hit by a train while walking on the tracks in Leetsdale this weekend. Officers say 51-year-old William Davidson of Ambridge was walking with his back to the oncoming train early Saturday morning. According to investigators, the train crew sounded the horn and tried to brake in a failed attempt to avoid hitting the man. Investigators are still trying to determine why Davidson was on the tracks.