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A cylinder is arranged to pump hydraulic fluid into a pressure accumulator. The stored hydraulic fluid operates a hydraulic motor to drive an alternator to generate electric power. The cylinder may be a single acting cylinder having a piston rod depressed by the weight of passing traffic on a railro

A cylinder is arranged to pump hydraulic fluid into a pressure accumulator. The stored hydraulic fluid operates a hydraulic motor to drive an alternator to generate electric power. The cylinder may be a single acting cylinder having a piston rod depressed by the weight of passing traffic on a railroad track or highway, or the cylinder may be a double acting cylinder having a piston rod reciprocated by a windmill, whereby otherwise wasted energy is converted into productive energy.

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A dynamic power source comprising a cylinder, a piston movable in said cylinder, an hydraulic accumulator, a cylinder discharge conduit connecting said cylinder with said accumulator to convey hydraulic fluid displaced by said piston into said accumulator, a check valve in said conduit to prevent ba

A dynamic power source comprising a cylinder, a piston movable in said cylinder, an hydraulic accumulator, a cylinder discharge conduit connecting said cylinder with said accumulator to convey hydraulic fluid displaced by said piston into said accumulator, a check valve in said conduit to prevent backflow into said cylinder, said accumulator having a compressed gas space in its upper portion to maintain pressure on said hydraulic fluid in the accumulator, an hydraulic fluid supply reservoir, a cylinder supply conduit from said reservoir to said cylinder discharge conduit, a check valve in said supply conduit to prevent backflow therein, an accumulator bypass conduit from said cylinder discharge conduit to said reservoir, valve means in said bypass conduit and cylinder discharge conduit to direct hydraulic fluid from said cylinder either to said accumulator or to said reservoir, an hydraulic motor, a motor supply conduit from said accumulator to said motor, an adjustable valve in said motor supply conduit to control the flow of hydraulic fluid to said motor, a low pressure relief valve in said motor supply conduit, a motor discharge conduit from said motor to said reservoir, a motor bypass conduit from said motor supply conduit to said motor discharge conduit, and a high pressure relief valve in said motor bypass conduit.