EMPLOYEE WAS REPORTING FOR WORK TO PLANT 1 CONTROL ROOM, WAS CROSSING TRACKS FROM PLANT 2. WHILEGOING UP THE SORT STAIRWAY TO THE CROSSOVER HIS TOE CAUGHT UNDER THE STEP AND HE FELL FORWARD, H IS FIST WAS STILL CLOSED WHEN HIS HAND HIT THE UPPER STEP, CAUSING A BREAK IN THE OUTER BONE OF HIS RIGHT HAND. NO RESTRICTIONS DUE TO THE NATURE OF HIS JOB.