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While we were in a learning phase wile planning our layout, I had 3 questions (that I've seen posted here too).... what's the minimum radius, what's the minimm clearance (for an over/under) and what's the maximum grade (all for n-scale). I got (and saw) roughly 12,455 different answers. But one "old timer' I talked with at a show had some good advice.... 2" & 2%. On our layout I had to use a little 3% grade to get what we wanted to do... and I do see a big difference in loco performance between the 2% section & the 3% section. BTW, I have more gray hair than not, so it shouldn't have been too politically incorrect for me to refer to a knowledgable model train guy as an old timer ;)
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