EE & 2 OTHER EE'S WERE IN TRACK ENTRY PREPARING TO HANG HI-LINE. NO WORK WAS BEING PERFORMED AT THIS TIME. EE SAID HE FELT PAIN IN HIS NECK. EE RET'D TO WORK ON 2/26/02, MISSED 2/27/02 CALLED IN ON 2/28/02 SAID OFF TILL 3/4/02 DUE TO BREATHING PROBLEMS