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I have 9 3/4" radius curves on my layout, dictated by the size available to me. In my experience, diesel engines the length of a GP7 work fine, and look okay. Engines the length of a GP38 work okay but look somewhat iffy, and anything longer will work and look awkward. <br /> <br />If I had space, I too would try to keep a minimum of 18" radii on mainlines, 15" on branches, and 12" in spurs. And those are minimums. <br /> <br />---jps
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