UNIT TRAIN 107X0 WAS TRAVELING NORTHBOUND ON THE CADILLAC SUBDIVISION WITH 4 LOCOMOTIVES AND 107 LOADS. THE LEADING TRUCK OF THE 11TH CAR (NS 298434) IN THE TRAIN PICKED/CLIMBED THE SWITCH POINT OF THE OWOSSO JCT. SWITCH AT MP107.67. BOTH AXLES ON THE TRUCK SET DERAILED TO THE EAST AND CONTINUED TOTRAVEL 0.93 MILES BEFORE ENCOUNTERING THE NEXT TURNOUT AT MP108.6. THE DERAILED CAR BEGAN TO TRACKDOWN THE AUXILIARY TRACK AS THE TRAIN CONTINUED TO PULL CAUSING CARS 9-14 TO DERAIL. CARS 9-12 FELLON TO THEIR SIDES TO THE WEST SIDE.