"The real innovation, gentleponies, is how its movement is powered. The vehicle has only three crew, and all of them are relaxed and seated comfortably. There is no magic involved in the propulsion. Slung underneath the base chassis is a steam engine of cast bronze, supplied with reservoirs of lamp oil for fuel and water for operation. The engine boils water with the fuel; pistons then convert the energy from the resulting steam into powered motion. With this motor, the Whirlwind can carry these three crew, and their equipment and supplies, for almost two hundred kilometers, and it can cover that distance in under two hours. Listen to its operation as the crew drives off again."