Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Thanks Stoker. It's 3.5 inch gauge. It has only simple cylinders. While it was made to represent a compound, there wouldn't be much point to making high and low pressure cylinders on such a small model. On the real 292 and other Ivatt compounds the inner (low pressure) cylinders were hidden between the frames. While high pressure cylinders used the Walschaerts' valve gear as in the model, the low pressure pair used ordinary Stephenson's link motion--duplicating that would have been a modeller's nightmare.