I want to use RailPowerSystem by Hermios, but since that mod replaces the standard rail with a new rail with "special sauce" (conducting third-rail), I wonder if this mod works with that, or will it cause an electric circuit breakage?

According to this discussion, rail replacement mods can "electrify" their rail somehow...

I'm afraid I won't have time to deal with it any time soon. Maybe you can write your own version of the mod that supports this. This mod here is already a fork of the original mod by therax. Or you can ask him if you don't need the multi-ore capability.