Elecric trains have a far better performance than a diesel in the 1960,s the deltics only produced about 2600hp at the rail(depending on speed) wheras the AL6(86) 25kV loco was producing about 4000hp, the gap in performance still exists. Electric Traction does have some disadvantages and few people allow for electrical transmission losses in their calculations, however the powers source can be what Coal, Neuclear, Wind, Tidal Whatever you want.
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