The top piece that goes on the splines is cut to radius.I just let the track overhang the base but it is probably better to make it about 1/2" wider than the track base. I used the 25"R not the 30"R track. I only did this once and the layout was larger than all my other Christmas layouts. With the proliferation of Snow Village in my collection I now leave everything flat so I can get more buildings on the layout. It is not really possible to walk on the styrofoam unless a 2'x2' or larger piece of plywood is put down to distribute the weight. Even then it is easy to leave indents in the styrofoam.
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