After I had the framework all done, I needed to add some "ground work." I chose to use pink insulation foam. This way I could carve the foam for scenery purposes as I went. I have seen other layouts that use cutouts from the plywood on the frame work, but then that would mean I would have needed everything planned out. Using the insulation foam allowed me to construct on the fly. As you can see from the following pictures I had some elevation changes and areas cut out under bridges.
In later pictures you will see some additional uses of foam such as small hills, overpasses and tunnels.
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