Plastic roadbed track (any brand) is designed for soft surfaces like pile carpet, not traditional plywood or rigid foam underlayment. Attaching the track with screws or other securement will exacerbate the issue. I would pop over to your local carpet retailer and pick up some plush carpet remnants and cut them to the rough shape of the track, and nestle it into the hollow voids. If that is not to your liking, I've also used 1/4"-1/2" EPDM sheet cut to be a roadbed. It will not conduct noise due to the closed cell nature of the product. You can find it at a HVAC distributor. Finally, speed is a factor with this type of track. If you run scale speeds, you will be fine. It increases in rail noise if running 125 smph like some postwar guys do. 
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