Ray, I sent him an email same day of your previous post but never heard back.
I'm simply asking what voltages come from the Atlas signaling system to drive the RYG signal head. I'm assuming it's a 4-wire cable with a common and one wire for each color. That way I can advise what (if any) additional components might be required to drive the relay modules. What do you actually have in hand?
Anyway, I'd like to have the information documented here on OGR so others might benefit. As for actually building this, I think you can inquire here on OGR if there's someone in your locale that can help as this is something I'd think you want boots-on-the-ground so to speak.
*** 4/26 update: Steve responded ***
