It's still a lot of weight to carry around a high-power generator, large-gauge power cables (or heavy transformers and smaller-gauge cables), and four electric

It's still a lot of weight to carry around a high-power generator, large-gauge power cables (or heavy transformers and smaller-gauge cables), and four electric motors. This is less of a problem on a train, because the train only has to deal with the additional friction, and doesn't have to worry about generating more lift to make up for the increased weight.