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Just completed a big expansion of the layout earlier this spring (see my other posts for pics of 2" foam installation), but I because I incorporated my original layout which is on 3/4" and 1" Medite (high density particle board) I have a constant noise comparison as trains run from one section to another... ......and foam is much much noisier....by a matter of many decibels. Don't use particle board, but certainly I would recommend plywood over foam if you do not anticipate wild climate control issues.
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