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I am not sure if I am answering your question, but ... In order to cross over yourself on a piece of track in HO scale you have to rise three inches, although three and one-half is better for planning purposes. To rise three inches at a two percent grade you have to travel one hundred fifty inches horizontally. In a three hundred sixty degree curve, the radius has to be about 25 inches to make it. If you want to get up three and one-half inches at two percent, you have to go one hundred seventy five inches which corresponds to a radius of about 29 inches, I think. (I'm doing the math in my head.) If this isn't the question you wanted an answer for, then please restate the question. Good Luck - Ed
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