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Seems clear that the larger the vehicle, the more likely a series hybrid makes sense. Trains are clearly large enough to warrant a series hybrid design.
I recall seeing a proposal for a jet-powered series hybrid garbage truck that seemed to make sense.
... the 50 MPG proposed efficiency in the OP is nothing to scoff at. Say you could get 55 MPG by going parallel hybrid. Does that warrant the complexity and cost of that drivetrain? More efficient isn't always more efficient.
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