> Hmm. And how much square footage do you estimate that would cover?
USA has 257,722 km of 1,435 mm gauge track, so… about 3.9 billion square feet there.
The EU is a bit less, but similar (208,211 km).
Worldwide is 1,370,782 km, various gauges. Roughly 21 billion square feet?
Should be good for a combined nameplate capacity around 393 GW.
> How would you run electrical lines by and through the constantly moving (expansion/contraction, as well as vehicle weight) heavy steel elements?
The trains and trams around here are electrically powered, so that’s already solved technically, and in cases like mine the solution has already been implemented.
I have no idea how the other stuff might influence costs.