ON 1-2-02 EE WAS ATTEMPTING TO RE RAIL A SUPPLY CAR USING AIR BAGS AND LIFTING JACKS. HE HAD INSTALLED AND INFLATED THE AIRBAG AND WAS ATTEMPTING TO MOVE THE CAR WITH THE JACK. WHEN THE CAR SH IFTED THE AIR BAG DISLODGED AND STRUCK HIM ON THE RIGHT LEG. EE CONTINUED WORKING THRU-OUT THE MONTH OF JANUARY BUT THEN BEGAN MISSING WORK ON 2-5-02.