Anyone had to deal with a double slip switch that reverses polarity from one cross-over side to the other? (Like that hasn't happened before LOL). I would like to know if you used two or three different power packs and how did you isolate the rails, ie. insulated rail joiners, gap, mica, etc. I currently have what could be considered a round loop that traverses from one mainline on an outer path to two inside of that. I know it's not much to go on now, but with the right questions asked of me I may be better able to describe it. This is a good conundrom for me to solve. Exactly why I love this hobby.