Would I need to taper the code 100 rail down to code 83 height at those particular 100/83 joints or do they make transition track? That's what I thought but I wasn't certain at all. If I understand "power routing" with electrified frogs correctly, the points send power to either track and kill power to the "other" track. If so, it seems as though I wouldn't need insulated rail joiners and power on/off switches for passing sidings because the turnouts themselves would determine which track is powered, and which tracks are not powered. Is that correct?