So, went sound proofing material shopping today from all the great suggestions here, found one thing nobody mentioned, wondered if there were any thoughts on it. Talking about the multicolored, made up of pieces of foam rubber, under carper cushion. One thing I noticed was that there was unevenness in any given area as to springiness, meaning there are harder spots in it. It was true on each side, not wavy or thick and thin, just the amount of give varied. With cork over it and regular tube rail, or MTH with plastic roadbed, looks like it might work, but does it have too much give and will cause the rail or roadbed to dip under a loco's weight? Anybody try it?
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