You clearly havent heard of swedish trains.

The railroad here is a bad joke at this point, mainly due to shutting down the organization that was responsible for maintainence and shoving it into another agency that has no clue. As a bonus the new agency doesn’t even do the repair work themselves but hires contractors at the lowest bidder. So stuff breaks constantly, which causes delays.

At this point just getting the rail network to “normal” standards would cost billions. Let alone expanding it to cope with current traffic levels.

I could see this working for either running cooling and such for refrigerated cargo or if they stick a battery in the trailer. In the latter case it would be possible to just charge it for free while the trailer sits in a lot somewhere. Then when the truck comes they plug in the battery and use the stored up power.