Interesting point. Also, the cars "draft" one another so the air
resistance is quite low as well.
It takes only ~0.6 HP to move per ton to propel a train 50 mph. About 5%
of the energy that it takes to move a truck or a car at the same speed.
http://www.brooklynrail.net/science_of_railway_locomotion.html
Bill D.
I agree for normal cars. But I have to wonder... what about railroad
cars? Their rolling resistance is vastly lower, they have a huge roof
area, and almost always sit in the sun. Could one make a commuter
train or freight train with PV panels on the roof of every car. Would
they collect enough power to be useful?
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