As with a lot of the 'Thunderbirds' tracked vehicles, they used the tracks and wheels from a 'Vickers' toy tractor. I have yet to ever come across one of these toys and they certainly seem to be rarer than 'rocking horse poo'. Therefore, I had to make the parts required.

These consisted of two sets of tracks, 6 idler wheels and 2 drive wheels. I cut plastic sheet into individual plates, to which were glued a smaller plastic section and two curved uprights. Each plate was drilled with 4 tiny holes. The plates were then glued to a length of thin plastic card, to enable them to form the tracks. However, when they were bent a few times, the plastic card snapped in various places. I then decided to glue them to the outside of an old cam belt from a car! Perfect, they could bend and operate like real tracks!