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A diesel electric train locomotive does use two power sources: diesel engine(s) and electric motors. It is a serial/series hybrid because only one of those drives the wheels directly. Why would they do this, I wonder? Would a transmission be better; and if so, why don't they use one?
If they electrified the trains (with overhead power), they would be even more efficient, and the regen would feed back into the system, and partially power other trains.
A Prius is a parallel/serial hybrid, because it uses either the electric motor and/or the ICE to power the wheels, and it can use the ICE to charge the battery, also.
And it turns out that the Volt, which has been claimed to be an EV, and a range-extended EV, but was always a serial/series hybrid -- actually also has a parallel mode; when driving at >70MPH in charging mode. So, it actually is a plug-in serial/parallel hybrid.
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