[greedo]

Electrifying railways seems easier than doing it to the US Interstate, since the railways control what goes on their tracks. The US has roughly 50K miles of Interstate highway. From what a cursory search showed, electrifying rail is roughly $1m/mile. So it would cost at least $50B to electrify, not to mention converting the semi trucks to use it. Considering how much of a hot topic EVs and alternative energy sources are, this is a non-starter in our current political climate.

And forgetting the practical components, the highways would look really bad with wires overhead...