Regarding hybrid autos:

Why haven’t highway tractors, and heavy duty diesel trucks adapted diesel-electric. It’s has been proven in trains, and big ships. The engine/generator could hold the same RPM, and the motor could change speed. The generator could charge a battery pack, if it’s getting low you increase the generator RPM to top it up. I see many advantages to this, the big one be better fuel economy. Also less meintence costs. One down side I see is weight, batterys and motors are not light.

What are you thoughts on diesel-electric trucks?