1/4" x 1-3/8" x 14' lattice stock,
1/2" plywood and 1" x 4", rough cookie cut, trim with router, lots of polyurethane
glue and spring clamps, cork painted grey, Atlas code 83 flex track and
switches, RTV adhesive/sealant and some solder, limit switch on the switch
machine to energize the proper siding.
Oh, the weight of the trapezoid
and all the stuff in it holds up the loop and the train!