EMPLOYEE ATTEMPTING TO CLOSE BULKHEAD ON LOADED BOXCAR. HE WAS USING DRIFT BAR TO ALIGN HOLE IN THE BULKHEAD WITH THE HOLE IN RECEIVING BRACKET. OTHER EMPLOYEE BUMPING BULKHEAD WITH HIS FORKLIFT TO PUSH BULKHEAD IN, DRIFT BAR SLIPPED CATCHING EMPLOYEE'S FINGER ON RIGHT HAND BETWEEN BAR AND BRACKET.