EE USED DOZER TO PUSH 60' LENGTH OF RAILROAD RAIL OUT OF THE WORK AREA. HE POSITIONED THE RAIL PERPENDICULAR TO THE DOZER BLADE. RAIL STOPPED MOVING FORWARD & DOZER CONTINUED TO TRACK. RAIL BOWED & SPRUNG UP OVER DOZER BLADE & CAME DOWN THROUGH LEFT SIDE OF CAB DOOR GLASS ONTO OPERATORS LEFT KNEE.