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cheap mountains
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If you're going to have one rail cross over another in HO scale you could very well need MORE than 3 1/2" of rise. Example: <br /> <br />If you're going to cross using a tunnel / mountain you MUST include the total thickness of the rail, railbed, and support. In my case that was almost 2" of material. This wasn't a big deal over the long haul as I was planning on putting in a thru-bridge for the crossing, but for the short term I was wanting to just continue my benchwork and foam over the span. Well, doing THAT left me with just 2 1/2" of clearance. O.K. for "N", but WAY too low for HO. <br /> <br />I ended up replacing the combined 3/4" plywood & 1" foam with some 1/2" OSB by itself. This will work fine in the short term, and I'll get slightly more clearance when I build the bridge. <br /> <br />Mark in Utah
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