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Drag is nearly the entire friction.

I am not sure about that. The rolling resistance of an inflated rubber tire on a concrete road is considerably higher than a steel wheel on a steel rail.

Furthermore (not strictly friction, but energy cost none the less) going up and down hills, unless trucks are powered in a manner similar to a Toyota Prius, the energy going down hills is not a benefit. Railroad engineers (the ones who design the railroad, not the ones who drive the trains) make heroic efforts to keep all grades below 1% and highway engineers do not.

In addition, the way modern electric and diesel-electric locomotives are designed, far more energy-saving measures can be taken than in a single truck. The cost that cannot be borne for a single engine pulling one or sometimes two trailers can easily be averaged out when pulling a 100 "trailer" train.
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