To propel the miniature train used for the crash scene, the train was connected by wires running down the tracks to the rear rims of a Ford Falcon on jacks. When the car accelerated, the wire would wind around the rims and pull the train.
For the film, preserved locomotive KA 942 had its pre-1947 streamlining removed and was renumbered KA 949 to match the actual Tangiwai crash locomotive.