Best is a subjective topic. I'll tell you what I used. I have #14 for all my longer track power runs, #18 for track power drops (one to two feet typically), and #18 for my turntable whisker track power. My switches are all wired with CAT5e #24 wire, they're DZ-2500 switch machines, very low power. For stuff like O22 or similar Lionel switches, I'd be using #18.
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