EE REAGGRAVATED PAST INJURY WHILE PERFORMING NORMAL JOB FUNCTION. EE WAS CLOSING A RAIL CAR & WAS BENT OVER WHEN HE BEGAN COUGHING WHEN HE FELT PAIN EE WAS TAKEN TO HOSPITAL .PAST INCIDEN T WAS NOT MSHA REPORTABLE. COUGHTIN REFLEX & EE POSTION CONTRIBUTED TO ACCIDENT