Derailment

YPD32R-02 SWITCHMAN UNDER CONTROL OF THE RCL WAS TRIMMING TRACK 14 OUT OF THE BOWL. TO SWING THE CUTTO THE DEPARTURE TRACK, THE CREW PULLED AHEAD USING THE DOCK LEAD AND WOULD NEED TO ENSURE THE DOCKCROSSOVER SWITCH WAS LINED FROM THE DOCK LEAD TOTHE RUNNER (MT1). THE SWITCHMAN OPERATED THROUGH THE CROSSOVER WITHOUT ENSURING THE SWITCH WAS LINED FOR HIS MOVEMENT. AFTER DRAGGING APPROXIMATELY 21CARS THROUGH THE IMPROPERLY LINED SWITCH, THE SWITCHMAN PITCHED CONTROL OF THE RCL TO THE FOREMAN.THE FOREMAN WAS PROTECTING THE MOVEMENT AT THE OTHER END OF THE CUT. AFTER SUCCESSFULLY INITIATING MOVEMENT, THE SPEED SOON DROPPED TO ZERO WHILE STILL IN THROTTLE. THIS WAS DUE TO 5 CARS REVERSING DIRECTION THROUGH THE RUN-THROUGH SWITCH AND DERAILING.