EE WAS TRAVELING ACROSS PLANT RAILROAD TRACKS ON A 4500# CAPACITY FORKLIFT WITH TIPS APPROXIMATELY 2"" ABOVE ASPHALT & BOOM TILTED FORWARD. RIGHT FORK TIP JUST HIT TOP EDGE OF RAIL CAUSING FORK TO BURY AGAINST RAIL IN ASPHALT. EE HAD SEAT BACK. THE FORCE OF IMPACT CAUSED SEAT TO DETACH FROM FORKLIFT. EE HIT STEERING COLUMN WITH CHEST & KNEES. HE WAS SEEN BY MD WHO GAVE RESTRICTIONS.