STANDING ON MOUND OF DEBRIS OF RETAINING WALL NEAR NO. 4 SUPPORT STRUCTURE, WHEN RAILROAD CAR STARTED MOVING NEXT TO HIM, AS HE TURNED TO SET BRAKE ON RAILROAD CAR, HE TRIPPED OVER OLD TIE AND OTHER DEBRIS. HE FELL TO THE GROUND STRIKING HIS FACE, LEFT SHOULDER AND LEFT WRIST. FINISHED WORKING SHIFT WITH OVERTIME.