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I am planning a much larger railroad and I am going to use open frame L-girder benchwork this time. How wide should the (plywood) subroadbed be on an HO scale railroad to permit attachment of scenery materials? Naturally I will be using two inch track centers so a single track portion would most likely be four inches wide. Also, since I am planning to use a backdrop, how far away from the drywall should I plan for the centerline of the nearest track to the wall? Thanks for your help. - Ed a.k.a. cablebridge
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