"The steam comes out of the boiler at high pressure and strikes blades inside the casing, setting the shaft to spinning. As the steam expands, the blades grow larger, thus the shape of the case. With this system, we can drive the shaft at speeds not achievable by traditional steam engines. In addition, the high pressure can spin up the shaft very quickly, reaching top speed almost instantly."

The man at the valve cranked it open. As steam roared out of the boiler, the familiar howl of ...