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The only locomotives with electric motors independent of the diesel engine (as battery charger) are the Canadian "GOATS", with battery back-up.
In all the conventional diesel-electrics, as more power is required to pull the train, and the motors suck-up more current from the dc generator or ac alternator, the diesel engine has to account for this. Suffice is to say that various ingenuous methods have been devised for the diesel to electric conversion function, and now digital technologies allow the most straight forward solution of 3-phase alternators - dc rectification - 3-ph.conversion to feed squirrel-cage induction motors.
We might also add that the hybrid Toyota Prius car can be battery operated in the city, but for uphill or motorway usage requires the engine to supply the extra power.
Delighted to answer any technical question.
Cheers from Dario
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