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Thanks for the info. Was able to find out the answers to most of the questions, thanks to a lot of the members of this and other forum sites (Guage, Atlas, etc). Still trying to verifying n-scale track spcing (center to center) within the helix. It appears that the 2-1/2" spacing for HO layouts (standard) will also work throughout the HO helix. I suppose that I can just take the ratio of HO to N scale (87/120) and multiply it times the HO helix clearance measurements and track spacing. That should keep u in the 'ball park'. The best percent grade or maximum recommended percent grade varies heavily between members of the various forums as many of them were really 'restricted' on space. We have a minor space restriction, but not 'horrible'. We would like to find the best percent grade without taking up too much space. It would be great to have a 0.5 to 1.0 percent grade, but it probably isn't necessary to achieve good operations and therefor the exceess use of space would be wasted', greatly reducing walkway space and layot space. thanks
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