Wilesco D18 Steam EngineWilesco D 18 steam engine with a blueish base plate that has been combined with a black boiler housing and silver colored engine plate. The flywheel is painted black. The technology of this engine represents a combination of Wilesco types D 20 and D 16, enhanced by a number of technical refinements. The brass boiler, highly polished and nickel plated, has a capacity of 30. 5 in. The condensed water is fed to a tank hidden behind the boiler house,