EMPLOYEE WAS WORKING TO PUT A DERAILED CAR BACK ON TRACK. HE HAD RAISED THE CAR WITH A TRACK JACK. AS HE ATTEMPTED TO LOWER THE CAR TO THE TRACK THE WEIGHT OF THE CAR CAUSED THE JACK HANDLE TO ""SPRING"" UPWARDS INJURING HIS RIGHT SHOULDER AND ARM. HE WORKED HIS REGULAR JOB UNTIL 01/16/2014. HIS FIRST REGULAR SHIFT MISSED WAS 1/19/2015.