An electromechanical power transfer system for a vehicle, comprises: an electrical power source; a system controller; at least two dynamoelectric machines; an electrically engageable clutch for each machine; an input shaft coupled to the jack shaft; an output shaft coupled to a load presented by the vehicle; and at least two electrically engageable transmission gear sets for coupling the input shaft to the output shaft; wherein the system controller selectively engages each machine clutch and each transmission gear set.