10-1/2".
Prototype: Royal Bavarian State Railways class S 3/6 express steam locomotive, subclass d, the "Hochhaxige" / "High Stepper" with 2,000 mm / 78-3/4" diameter driving wheels. Road number 3622 in a greenish [...] functions. It also has controlled high-efficiency propulsion with a flywheel, mounted in the boiler. 3 axles powered. The locomotive and tender are constructed mostly of metal. The running gear is intricately...