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Track subroadbed
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I went with a 2X6 framework underneath, with a piece of 1/4" luane plywood on top of that, and then 2" foam board on top of that. In N scale, 2" is almost 27 scale feet, so its more than thick enough to alow me to carve out all my depresions while providing a thermally stable platform to glue roadbed and track to. If you use a steaknife heated with a propane torch its literally like a hot knife through butter as far as carving landforms go. Dont breathe the foam fumes in however, they are toxic.
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