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I think two or more DISTINCT power sources is fairly self-explanatory.
A diesel electric train uses a diesel engine to generate electricity, which drives the wheels through electric motors. Primarily because most mechanical transmissions will not hold up to the stresses.
Not a hybrid.
If you recovered the braking energy in some form of storage and used it for re-acceleration, then it would be a hybrid.
It was interesting to read that they tried diesel hydraulic trains, and they were more efficient that the diesel electrics, but had reliability problems.
regards
Mech
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