A steam engine as a cardboard kit, powered by real boiling steam. This model is not only magnificent to look at, but it also works wonderfully. The boiler made of corrosion-resistant aluminum features a magnetic pressure relief valve, and the fire from five tea lights is shielded by a galvanized wire mesh. The steam is directed through a closed hose and foil system and released outdoors via a chimney. While the power output remains modest, the safety-related boiler pressure does as well.