Home layout had green carpet on 1/2 inch ply with Homasote roadbed covered with grey carpet. In keeping with the carpet layout idea. The sound of the click clack was fantastic.
All else was extremely quiet.
By the way, the stuff under the ties is roadbed. Subroadbed is an additional layer that would be put under that for a more realistic effect.
An example is HO track laid on HO cork roadbed on O cork roadbed. There is a realistic stepped effect.
