Some, but not all, magicians have interests outside magic. Gus Davenport in the 1960s enjoyed building an 00 gauge model railway with his teenage son John. The design concept was to have track circuits at different heights, so maximising the number of trains that could run simultaneously. This approach automatically generated the need for bridges and tunnels, both much loved by Gus and John. John makes a brief appearance, almost certainly correcting a derailment.
This film was shot by friend and magician Harry Baron. Harry managed Gamages magic department and also had his own magic company. He was a well-known figure in magic. See also N1969.