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Well, I suspect it's pretty much of a dead heat. Also, I'm guessing a lot depends on what's under the roadbed. I tried to do as much as I could to make the base layout quiet. All the parts of the main layout are solidly attached, no chance of the plywood vibrating on the benchwork below, etc. Then there's a layer of Homasote to add to the vibration deadening properties of the table.
 

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First layer is 1/2 inch OSB screwed to the framework then 3/4 inch high density foam glued down using silicone caulk. Then the track is glued to the foam with the same silicone caulk. Since mine is an industrial layout, I don't need a raised roadbed for a main line.
 

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As I said above I use cork on plywood. Locomotives and rolling stock run silently. Even on elevated sections on risers.
 

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3/4” plywood, 1/2” homasote, cork on mains, nothing in yards. Ross track and turnouts, Brennan’s ballast on all. No noise.
 
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