I want to see a turbine/electric hybrid. Closed-cycle turbines are very efficient, burn clean, make good power, and can run on just about anything (gas, diesel, propane, hydrogen, etc.)
Their weak spots are non-instantaneous response because they want to run at a constant, high RPM, and the lack of engine braking, but an electric drivetrain would solve both of those problems, just like a diesel-electric locomotive works.
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