EE WAS MOVING A RAILCAR. WHEN HE APPLIED THE HAND BRAKE TO STOP THE RAIL CAR HE FELT A PULL IN HIS ABDOMENAL MUSCLES. EE WAS ASKED TO GO TO DR BUT HE DECLINED UNTIL 3/13/01 WHERE HE WAS DIAGNO SED WITH A POSSIBLE MILD HERNIA REQUIRING MODIFIED DUTIES. FIRST DAY OF MODIFIED DUTY WAS 3/14/01 AT WHICH TIME THE INJURY BECAME REPORTABLE.