[ChrisjayHenn]

I would think the idea has merit if rather than purpose-built rails, the existing rail infrastructure is retrofitted (and built out) to act as a storage mechanism with freight that already has to move anyway. If that's done though, a proof of concept would need to be built first. So I wish these guys all the best, despite the fact that the economics look kind of silly on the surface.

[evgen]

In this case you are talking about electrifying the entire US rail infrastructure. Definitely not cheap...

[cmdrfred]

And then you compare these costs to atomic power and it becomes clear that it is the only real option.