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The main purpose of the traction motor combo is to convert electrical energy to mechanical energy for driving the locomotive wheels, a process referred to as motoring. 

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The traction alternator supplies the electrical energy. 

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The secondary purpose of the traction motor combo is to convert the mechanical energy of slowing a moving locomotive to electrical energy utilizing a process referred to as dynamic braking. 

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In dynamic braking, the traction motors function as generators with the electrical energy that they produce dissipated as heat in the dynamic braking resistor grids.
