@Hot Water posted:We didn't put ANYTHING on top of the plywood. We used VinylBed "flexxbed", under the track (3/8" for the main lines and 1/4" for sidings & yard tracks). The scenery just went on the plywood. Simple, and looked great without spending loads of money.
Yes, similar - just cut out roadbed with beveled sides from Homasote using the bandsaw (low dust!), glued and screwed that to the plywood, backed out the screws the next day. Track on the Homasote roadbed and scenery built up directly on the plywood.