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I have 2 large helixes on my layout. Both work well, (finally) but don't be fooled, Helixs take a lot of work to build. I won't go into how I built mine, just offer these cautions: 1) they take a lot longer to build than you think. They must be built very carefully or they don't work well. 2) I used double layers of masonite to keep the road bed thin. Problem with masonite is that it more easily flexes from side to side (perpedicular to the rails) so if you don't get the helix supports at the right elevations this twisting ends up derailing trains. If I do it again, I'll use threaded rods instead of notched risers (or L brakets, which I used in some spots as well) to allow easy up/down adjustment. 3) They take up a lot more space than is first evident, since the riser supports on the O.D. of the helix add to the foot print. GOOD LUCK.
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