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LISTEN to Mark: For a layout this big I'd use a Digitrax PM4-2 and break the layout into several electrical sections so a short in one wont affect the whole layout. I feed my PM4-2 with 12 ga. wire and then use 16 ga. for the feeders under the track. I use 18 ga for the drops from the track to the feeders. I don't like the suitcase connectors and so I solder or use terminal blocks. The terminal blocks make for easy trouble shooting. As far as color codeing, I use the same color for the same rail no matter what block as I have each wall on the same block - upper and lower. Gray is always the rail closest to the wall and green is the rail closest to the inside. I have an around the wall layout. Bob
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