Use a chem lab cork borer to punch holes in carpet or a leather belt hole punch. As for roadbed, I prefer the Johnson rubber roadbed for my standard gauge track. It comes in both 042 and 072 sizes. Advantages are twofold: grips a smooth surface and resists sliding, and offers some noise abatement. Easy to cut to fit and its drop-in design makes it easy to remove or add sections. It is essentially a remake of the Lionel prewar roadbed that originally included crossovers and switch sections. Not for everyone, but works for me!
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