For my large tinplate layout (O and Std) I used 1/2" OSB with standard carpet padding glued to the OSB. The carpet padding was sprayed green (latex) and I used a textured paint for the ballast. The track is all glued down. I used screws to hold the track in place until the glue dried. The carpet pad was inexpensive and the result is very quiet trains - except when the sound is turned up.
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