Unless you scale it up (diesel electric locomotive) you loose too much energy going from gen-set to motor.  It makes more sense to just send the mechanical energy from the engine straight to the wheels.  Generating power requires a close to static engine speed and optimizing for that is very much in conflict for optimizing the typical emissions&#x2F;fuel economy&#x2F;power&#x2F;reliability&#x2F;price criteria by which cars are assessed.<p>It would also almost certainly be diesel.