This will be a solution to make functional machines, I saw in other versions (1.7.10) the use of cables to give energy to the machines, but now we only use batteries, the solution is a block to transform RF, EU, etc. in railcraft energy.

You also can create charge (the new power option in railcraft) with turbines and transfer that with the in mod wire (the name escapes me at the moment)

There is an existing Redstone Flux (Forge Energy, if you prefer) transformer. It's called, not surprisingly, Flux Transformer.