4-cylinder steam engine? This model was working for the collector who has sadly passed away, and I don't know the exact workings of the engine. Therefore, I'm offering the model as is, without any guarantee of functionality. It's a technically sophisticated model that's not only suitable for playing with, but also makes a decorative addition to any display cabinet, display case, or desk. Ideal for a steam engine enthusiast. See pictures! The pictures are part of the description! *Note from Expert - This item is fresh to the market. This model is sold untested. As a live steam working model, it must be inspected and verified by a qualified engineer before being fired or put into operation. Buyers should be aware that the item is offered without boiler certificates and is therefore sold strictly as a decorative object. No guarantees are made regarding its working condition or safety.