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I have an H.O. scale layout & the thinnest wire I use is 22 ga. on the drops to the main feed. I use solid core copper wire to solder to tracks & I get it in 100 or 500 ft. spools at my local hardware. a 500 ft roll(spool) sells for about $24.00. My mains(black & white) <br />is 14 ga. stranded. I used a smaller gauge wire & had a lot of voltage drops. Even on the swiches I use 22 ga. wire & U can get that in 2 or 3 solid starands. Usually red, white & black or green. radio Shack also sells all kinds of wire. Speaker wire is too light <br />for trains, even "N" ga.
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