Roger models in N scale and asks:

“I am going to use cork under my track, but have noticed that foam insulation is commonly added on top of the plywood base. I know it adds some height but why not just place the scenery/landscape directly on top of the plywood? Why not just attach (glue or nails is a whole different topic ) the track and landscape directly to the plywood? What’s the advantage of adding the layer of insulation?”

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