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    How to mock-up the right-of-way in full size?

    How do you mock up your track before committing to permanent structures like risers and sub-roadbed? Elevations are a concern because I'd like to have a switch-back over itself (look up Gumstump and Snowshoe). The current bare platform is 1 inch rigid foam over 1/4 inch ply over 1x4 framework... is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to