A transition wiring system is provided. The transition wiring system may include one or more traction motors, a first generator, and a second generator. The transition wiring system may also include a first device, a second device, and a third device, each device configured to block reverse current flow. The transition wiring system may further include a single transition contactor disposed between the first generator and the second generator. The first generator and the second generator are configured to be selectively operable in-series and in-parallel.