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I have a large "ho" scale layout and utilize the helix operation a couple of different applications. My layout is multi-level, 4 levels, and the best operating in helix is 3" centers allowing the 85' passenger cars. Also my raidus is no less than 28, thus allowing me to best utilize the space. My incline is a full 3% and I have no problem pulling a 30' train through with two power units.
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