EMPLOYEE WAS ON LOCOMOTIVE WHICH WAS PULLING CONCENTRATE CARS. THE AIR BRAKE SYSTEM FAILED RESULTING IN DERAILMENT. THE EMPLOYEE JUMPED FROM THE TRAIN, INJURING HIS RIGHT KNEE, RIGHT HAND AND LEFT SHOULDER. HE WAS TAKEN TO THE DOCTOR AND DIAGNOSED WITH KNEE STRAIN. HE IS TO USE A KNEE BRACE AND CRUTCHES FOR A WEEK, THEN TRY A WEEK WITHOUT; FURTHER EVALUATION AFTER THE SECOND WEEK.