Problem is those railroad cars usually don't share origin and destination. And spending a day or two on the switchyard for every couple of hours of actual trave

Problem is those railroad cars usually don't share origin and destination. And spending a day or two on the switchyard for every couple of hours of actual travel isn't what customers want. The beaty of platooning is that trucks can join and leave while traveling at speed, all they need is a free lane on the side. And if you really want to tease out all the efficiencies of rail, without suffering the drawbacks, you make electrified lanes that also have embedded tracks (like those of a tramway, but designed for higher load) and make the trucks multimodals that can switch while moving. Actually just those trucks that would see an economic advantage, trucks designed for light, high volume loads would likely stick to road wheels only. A setup like this could actually be super economical compared to two because a rail network needs huge separation between trains because rails are terrible for braking fast. Multimodals on the other hand could be designed to be able to switch to their road wheels in an emergency. And a rail network needs an ungodly amount of nines in terms of reliability and rarity of maintenance, because there is no plan B network. Reliability nines are expensive. Multimodals on the other hand could easily be diverted to a dirt road for a bit when the main lanes are defective or going through maintenance. Where they would be running on the same batteries they carry anyways, for the last couple of miles on regular, non-electrified roads.