TRUCK CROSSING RR TRACKS AND WAS HIT BY TRAIN ENGINE. DRIVER WAS THROWN AROUND IN THE CAB CAUSING INJURY TO LOWER BACK, A BROKE TOE & LACERATIONS TO FOREHEADF. DRIVERSAID HE COULDN'T SEE ENGIN E UNTIL HE WAS ON THE TRACK. WHEN HE SAW THE TRAIN HE STOPPED & TRIED TO BACK UP. AN UNCOUPLED TRAIN ON THE OTHER TRACK WAS BLOCKING HIS VIEW.