Ooh, ooh! That’s a great idea; an electric vehicle which doesn’t need a big expensive battery. We could put some metal rails in the road for the ground return!
In fact, rolling resistance of a steel wheel on a steel rail is much better than rubber tyre on asphalt road. So how about we take a bus and run it along the rails?
Ideally, it would be nice to separate such a means of transport from the regular roading network. With such a separation we could schedule regular services and avoid traffic jams from overloaded roads.