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Well, being new to the hobby and building my first layout, I don't know any better. But I like cheap stuff that works. On my mainline that curves around with changes in grade, I use 1/2" inch blue/pink foam insulation board, glued to OSB with poyurethane spray foam (the kind that is meant to fill holes and cracks). On flat areas, where I use foam insulation board on top of 14" plywood, I use white 1/4" presentation foam board (Office Depot) on top of the insulation board. I simply cut it with a box cutter in the shape of the track and glue it to the blue/pink insulation board with polyurethane spray foam. I use 'concrete' silicone caulk (Home Depot) to glue track down in both cases and embed the ballast directly into the caulk after I lay the track. Polyurethane spray foam can also be used to glue track down and it dries clear if not laid down in excess. It is the stickiest stuff I have found and I have used it routinely to glue pieces of 2" foam insulation board together. When cured, the bond will not break between two pieces of blue/pink poly foam. Caution: wear gloves if you use this stuff. You can't get it off your skin. <br /> Bottom line: A super quiet system. I ran trains for the first time last night. All I heard was clickity-clack over the switches! <br />Bryant <br />
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