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This may prove useful .. you can either ..
1 - look down the left column and find the NPS (Nominal Pipe Size) .. the follow the row to the right under your scale and find the size wire/tubing to represent that pipe.
2 - Follow the column for your scale down to the size that matches the...
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ModelRailroadBookstore.com - An online model railroad bookstore featuring a curated selection of new and used books. Layout design, track plans, scenery and structure building, wiring, DCC, Tinplate, Toy Trains, Price Guides and more.