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Is there any real life use of a helix or is it just a method to change levels in a confined area for a model? I am working on a plan for my first layout in 30 years and after getting my feet wet with a double oval I am thinking about a mountain switchback or a quarry with a narrow gauge line circling down the parimiter. The helix at the above mentioned website looked much to uniform to use for anything like that.
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