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Chad; The Track Planning for Realistic Operation book by John Armstrong would be a great help. At page 48 there is a chart showing track centers for curves. Grades and the effects on pulling capacity are shown at page 49. I have a double track helix with spacing sufficient to run 89 foot cars on both tracks with a 2 to 2.25% grade. The track centers are 20 scale feet in HO and it is 4.5 turns. As mentioned to Les, there is a kit advertised in Model Railroader. Good luck, Mark
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