Kingda Huh? The Hydraulics Room that Powers Kingda Ka.

On the bottom is a reservoir filled with hydraulic fluid. In the middle are a few of the eight 500 hp hydraulic motors through which the fluid is forced to generate energy. On either side are the accumulators that store the produced energy. At a precise moment, the accumulators release the energy to the winch on top. The launch cable, which is connected to Kingda Ka's train, is wound around the winch. This 20,800-peak-horsepower system is capable of repeatedly launching Kingda Ka from 0 to 128 mph in 3.5 seconds.