A GEAR BOX WAS BEING PULLED INTO A XCUT WITH A LOCOMOTIVE USING A 3/8"" WIRE ROPE. AFTER LOCOMOTIVE STOPPED PULLING, EE STARTED WALKING TOWARD THE ROPE TO CHECK LOCATION OF BOX WHEN THE ROP BRO KE, STIRKING, CAUSING HIM TO FALL. HE STRUCK THE BACK OF YHIS HEAD ON A SUPPLY CAR WHEN HE FELL.