and congestion. You can't awoid that.

The energy efficiency of trains versus cars is a very complex thing to analyze

Really? Could you elaborate on this? From everything I read, trains are much more energy-efficient than cars, primarily because of economies of scale. Even for high-speed trains, I recall equivalent figures at average seating in the range of the PSA diesel hybrid Jérôme blogged about.

_{*Lunatic*, n.
One whose delusions are out of fashion.}