EE WAS SUPERVISING A CREW THAT WAS ATTEMPTING TO RERAIL A BATTERY CAR THAT HAD COME OFF THE TRACK. AN AIR BAG HAD BEEN PLACED UNDER A DECOUPLER ON ONE END OF THE WRECKED CAR. AS IT WAS BEING I NFLATED IT POPPED OUT FROM UNDER THE DECOUPLER AND HIT EE ON HIS RIGHT KNEE, RESULTING IN A TORN MEDIAL MENISCUS. THIS DID NOT BECOME AN LTA UNTIL 4/20/01.