Dave is correct. You would have much better results using rigid foam board. I use occasionally when needed 2" thick 4 X 8 sheets. I found them to be available at Loews and H D . The 2" thick version can be used by itself and forms a great base to work from. I use Woodland Scenic s "Foam Tack Glue #1544 to hold the track in place. The glue dries quickly and clear.
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