Battery powered locomotive

A locomotive, comprising:

• a DC power bus comprising a DC auxiliary bus, a DC battery bus, and a DC traction bus, the DC power bus for providing a DC voltage to components of the locomotive when the locomotive is operating in a motoring mode, a charging mode, or a dynamic braking mode, wherein the DC auxiliary bus is selectively connected to the DC battery bus, and the DC battery bus is selectively connected to the DC traction bus;
• a plurality of batteries connected across the DC battery bus for providing power to the DC battery bus when the locomotive is operating in the motoring mode, and receiving power from the DC battery bus when the locomotive is operating in the charging mode and the dynamic braking mode;
• one or more traction motors, each traction motor comprising an armature winding and a field winding that are selectively connected in parallel across the DC traction bus, the one or more traction motors operable to receive power from the DC traction bus when the locomotive is operating in the motoring mode, to provide charging power to the DC traction bus when the locomotive is operating in the dynamic braking mode, and to receive no power from the DC traction bus when the locomotive is operating in charging mode;
• a charging source connected across the DC auxiliary bus for providing charging power to the DC auxiliary bus, wherein the charging power is less than power requirements of the one or more traction motors when the locomotive is operating in the motoring mode;
• and
• a power dissipation device selectively connected across the DC power bus for receiving and dissipating excess power from the DC power bus when the locomotive is operating in the dynamic braking mode,
• wherein when the locomotive is operating in the charging mode, the DC auxiliary bus is connected to the DC battery bus, and
• wherein when the locomotive is operating in the motoring mode and when the locomotive is operating in the dynamic braking mode, the DC battery bus is connected to the DC traction bus.