CREW HAD JUST SWITCHED OUT 2 CARS AND PULLED OVER THE TK-1 SWITCH, THE COMMAND BACK 5 CARS TO A CUTWAS GIVEN AND WHILE SHOVING OVER THE TK-1 SWITCH THE CAR PICKED THE SWITCH AND THE SOUTH TRUCKS DERAILED AND WENT APROX 100 FT. THE CREW RE-RAILED THE CAR AND WHEN THEY PULLED BACK OVER THE SWITCH, THE RAIL ON STRAIGHT TRACK IN TK-1 WAS BROKEN.