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I am designing a rather large layout that will have a helix to get from one level to another and I can't recall anyone saying anything about maximum grade on them. Does anyone have any practical experience in this quandry, or is their some formula based on the radius that is to be laid? Obviously it has to be enough to clear the top of the cars on the level below it, but just how steep can you go, and do you need to reverse camber the curves? Bob Thompson
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