When I built 8x4 layouts for each set of grandchildren, I used #16, since no runs exceed 4'. For my layout, based on 75 years experience running trains, I use nothing less than #14 for trains. Experience has taught me that slight voltage drops have serious effect on these low voltage (18+/-) devices. If you have heavy load accessories, like #97 postwar coal loader, #14 also. For Z-Stuff switch motors, #20 is fine.
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