A man trying to kill his girlfriend by leaving her in a car parked on railroad tracks was himself killed when a commuter train launched the vehicle into him as he tried to flee, police said. The girlfriend survived. The man drove the car in front of a group of other vehicles stopped at a railroad crossing Monday in the San Fernando Valley neighborhood of Sunland, Officer Mike Lopez said. The driver, who was seen arguing with his girlfriend, parked the car on the tracks and jumped out, leaving her behind, Lopez said. A northbound Metrolink train hit the rear of the car, hurling it into the man. The girlfriend was taken to the hospital, where she was in stable condition, Lopez said.