Now that is an idea Mark. When I was building my Christmas tree layout, I was talking to Phil at work who was at the time an intern engineer. We both share a love of trains, and he had suggested the foam board to try to deaden sound. I did also use Rossbed for the roadbed on it, so no pesky magnification of sound as if the rails were right on it(I believe someone had posted about it having that effect somewhere).
After I had built it all, I had though about if it could be used to help add some scenery details. Well, I didn't go with that, but did have another idea over the summer. I had thought about something like dinner placemats being used to make a base for doing grass base or even creating a movable base that would be cut to a specific size for whatever was needed. It could be cut to hug the rails and provide other such spaces here and there. Since it is a plastic mat of sorts, figured it would fit into spots pretty well. Never thought about styrofoam for some reason. Maybe because I always think mountains when I see those.
