My somewhat temporary layout started with Fastrack on 3/4" plywood, but I ended up adding indoor/outdoor carpet in between, and that reduced the track noise quite a lot. Speed of trains is also a large factor with any track system - I have no trouble at all with Fastrack noise when I'm running trains at slower, more prototypical speeds. Once I get trains up to Legacy speed step 3 or greater, track noise becomes more apparent, but it's definitely not drowning out Railsounds and my locos do not have their volume maxed.
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