INJURED WAS CLOSING RAILROAD CAR DOORS USING A COME-A-LONG AND A BAR. THE CARS HAD SOME FROZEN MATERIALS IN THE CARS, AS HE WAS USING THE BAR TO HELP CLOSE THE DOORS, THE BAR SLIPPED OUT CAUS ING HIM TO FALL BACKWARDS PUTTING ALL HIW WEIGHT ON HIS LEFT LEG & ANKLE CAUSIN GHIM TO FALL TO THE GROUND.