EMPLOYEE STATEDTHAT HE WAS ON THE BACK OF A RAILROAD CAR CHECKING AN AREA ON THE CAR TO SEE IF IT NEEDED TO BE PATCHED. HE STARTED TO DUCK HIS HEAD UNDER A METAL BAR ON THE RAILROAD CAR TO GO UNDERNEATH IT. HE RAISED UP HIS HEAD TOO QUIK AND HIT HIS HEAD AGAINST THE METAL BAR RESULTING IN A CERVICAL STRAIN.