As he touched down Arriving the aircraft began Process_start to slide Motion backwards on the wet surface .

Watson attempted to retract Removing the landing gear to arrest Arrest the slide but this failed and the aircraft slipped Motion_directional backwards off the container and onto the roof of a van parked Placing on the deck .

The leading bogie of the locomotive derailed Motion_directional on hitting the trolley , but the driving wheels did not ; the engine continued onwards until it hit a diamond crossover at the north end of the station when it became completely derailed , detached from its tender and ended up facing backwards .