Steam locomotives equipped with a gear wheel were used. Economical production is provided by making the gearbox from just three sizes of gear wheel. In the lower part is a section of a gear wheel. This drives a cast iron gear wheel with 48 teeth. The nose gear wheel is steered by a Steer by Wire system. The "wallower" drives a gear wheel with 31 cogs. It shows a gear wheel, bordered by corn stalks and sugarcane. The primary symbols of Theta Tau are the Hammer and Tongs, and the gear wheel. In a Buchli drive a driven gear wheel is securely fixed to the locomotive frame. This drives a 25 stave gear wheel which drives a "wallower" (30 cogs).