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For HO height, if you have your HO NMRA gauge, and make it higher than the little points on the top you will be able to run everything, with the gauge standing on the bottom track. Same with N scale and the NMRA gauge. Better to be a tad to high than a tad to low. Who knows, 20 years from now you might have guys wanting to run AutoMaxs and the like. <br /> <br />I have 20 inches of separation between levels and I find that works fine. But what I suggest is get some cardboard and mock up what you are thinking about at the widest point the two levels will be - to see the tunnel effect. You can do this in about 10 minutes or less with a friend. You will learn more about your plans doing this than anything we can write in a forum. When I did it, I discovered I needed more separation than what I had planned. <br /> <br />Remember the more track in a helix, the longer you won't see trains and have to wait for them. You'll be amazed at how long a train will seem to disappear in a 24 inch separated helix. At a 2% grade, that is roughly 96 to 100 feet of track (not double tracked). So in separation you need as much as you need and not an inch more.
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