SWITCH CREW WAS SWITCHING THE CAR REPAIR TRACKS AT VALLIANT. THEY WERE HANDLING A MIXED CONSIST (LOADED PAPER CARS AND EMPTIES). THEY WERE SHOVING UP A GRADE IN A SHARP CURVE USING TWO ENGINES. ATSF 600625 WHICH WAS EMPTY CLIMBED OVER THE CURVE LEAD OF THE SWITCH AND DERAILED CAUSING TWO LOADS OFPAPER TO DERAIL AND ONE OVERTURNED (RBOX 31825).NoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNone