Wilesco D405 Steam Traction Engine BlueWilesco D 405 mirror polished and nickel plated boiler, diameter 1. 8, length 7. 3 mm, boiler capacity 14 in, with water gauge glass. Double action reversible brass cylinder, with flywheel, spring loaded safety valve, steam regulator, steam whistle, steam jet oiler and footbridge. Smokestack, traditional steering wheel chain drive. Flywheel with a diameter of 3. 2" with grooved pulley. Clutch engaged gear wheel, permitting the use of the machine as a