The base of my layout is 1/2” plywood. The mains and some sidings are on cork roadbed while spurs and secondary tracks are directly on the plywood as is my engine yard. Some minor undulations are made with foam. I have piled play sand here and there and layered over dirt and ground foam for transitions and bumps, wetted down with ‘wet’ water and adhered with diluted white or carpenter’s wood glue.
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