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Atlas has a great book on wiring layouts and of course promoting their line of switches. The essentials are one rail is common and can be continuous and only requires it to be wired at one spot. The other rail needs to be cut at both end of the block. The cut can create derailing problems if not filled with something. The gap can be filled with a piece of strip plastic glued in the gap and filed to shape or insulated track connectors. The insulated track connectors can cause a gap on the other side. I use two insulated joiners at the end of each block to eliminate the gaposess problems and wire both rails in each block. Electrical switches between the power source and the track determine which power source and which direction. There are single power packs with dual control but it's generally regarded as best practice to have two separate power sources.
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