Hi George, In this case, there is no scenery at all. So, partly for the look and much for the sound-deadening qualities we use carpet, this time a high quality, low pile indoor-outdoor type. If there were to be scenery we might well use an even flatter/no pile industrial type carpet that quiets everything and also takes scenery well. Whatever combination works for the job-at-hand, but with Hi-Rail and Conventional O Gauge Trains, layout "quietness" is a major consideration for us.