EE WAS OPERATING THE TRACKMOBILE TO MOVE RAIL CARS. AFTER CHANGING A SWITCH ON THE TRACKS, HE STARTED DOWN A TRACK AND THOUGHT HE HAD ENOUGH CLEARANCE TO PASS BY A RAIL CAR ON THE ADJACENT TRA CK. THE FRONT OF THE TRACKMOBILE STRUCK THE EDGEOF THE RAIL CAR. THE EE DID NOT REQUEST MEDICAL TREATMENT UNTIL AUGUST 17. THERE WAS NO TREATMENT BY THE DR. THE EE S KNEE STARTED TO BOTHER HI