This is not just an electric RC tank that has been decorated in a steampunk style. This is an authentic steampunk tank because it's powered by real steam engines!
Ian's tank has a steel model Tiger II tank as a chassis. The two steam engine and the boiler are ones used in model railroading. A mixture of propane and butane from a 120 ml tank heats the boiler. Ian built the armor, turret, and aesthetic finishes with brass, steel, and aluminum.
Battery-supplied electric power provides lights and sound effects. As you can see in this video, it's visually impressive.
-via Hack A Day