No thanks, I have it. I wanted to be sure you could see Fig 26 of Sect 4 Chapter 2 which shows the system up to the rails. I could not find any of this in the wiring diagrams and so the control box is still a bit of a mystery. It might be covered in mod sheets which I'm still in the process of cataloguing. According to my index, it seems I have copies of mods 472, 795, 968, and 1021 that speak to the R.P additions and so I'll need to go through my files to find these.
Back soon, hopefully.