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It's also the basic premise of GM's Volt (except gas instead of diesel). You have an electric drive, battery pack and generator that only runs once the batteries drop down to a certain level.
I think the possibility of more train-like transportation is a definite possibility in the future. Imagine taking a modular approach to your standard car. Have a very aerodynamic powered front 'car' towing a single occupant passenger 'car' with a fly-by-wire control scheme. Add passenger 'cars' as you need them, and hook up with others for power-sharing and the aerodynamic benefit. Add a battery car with solar collector for range extending.
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