Abstract: A system for converting heat to kinetic energy, the system characterized by a fluid driven motor responsive to an introduction of high pressure fluid for driving a selected power train, and a pressure generator for introducing the high pressure fluid to the motor. The pressure generator includes a plurality of boiler tubes for receiving low pressure fluid, a fire box for successively transferring heat to the boiler tubes, and a pressure equalizer for incrementally equalizing pressures within the boiler tubes, whereby an introduction of low pressure fluid, followed by an efficient conversion to a high pressure fluid, is facilitated within the system.