Abstract: An Electro-Mechanical Propulsion System for vehicles, wherein the prime mover 10, such as an internal combustion engine, drives an alternating voltage generator 20 through a first shaft 30 at a constant RPM controlled by a speed governor 40; and wherein the alternating voltage generator 20 serves as a source of energy for an electrical energy conversion unit comprising a controlled rectifier 50, a polyphase signal generator 100, an analog control unit 150, and a regulated DC power supply 140, to further provide a variable power and frequency source for an AC traction motor 60 coupled through a second shaft 70 to the vehicle wheel drive system 80. Operator manual or pedal control of the system is further provided by a speed control potentiometer 110, an acceleration control potentiometer 120, and a torque control potentiometer 130.