I agree, but I was mostly commenting on what Lou had said:
A decent sized battery pak, a small diesel tuned for economy at a couple of different rpm's driving a generator
Hybrids, other than diesel-electric trains, use batteries. That means storage, buffer storage. How to design/spec for a lot of loader work? Would seem that more batteries would have to be used, which then starts pushing up against the size available for the diesel engine. Regulation is one thing, having enough power to meet the various tasks, and do so fluidly, is another...