Would it be possible to add electric overhead power for the trains?
I'm not sure how much Factorio v2 has changed rails, but there was a realistic electric trains mod (seems to have gone now) that did this before, by allowing power poles where the signals would be placed.
I think this would be a valuable addition, but if it's not feasible or too much work, don't feel the need to add it :)

How would that function differently from my current Powered Rails?

Leaving aside that while possible, I don't know how to do it, and I don't have art or the skills to make something decent.

It's more of a visual thing, it would just look closer to what we more commonly have in the real world. I was just curious, since someone did something similar before here: https://github.com/Alco4998/FactorioRealisticElectricTrainsSimplified, but it hasn't been maintained. So I think the logic is there. The art part being difficult is understandable.

There's no obligation to do this, just a suggestion.

Yeah if I could do that, I would. I would like to, cause that would make it quite obvious where the powering is, but as I said, I don't have art, and lack the skills to make it.