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I just finished my layout. Its 13'X25' with a 2&1/2 turn8' helix at one end. Its all made from 1x4 poplar ripped into 3/16"x3/4" Its a double main including the helix and it was easy using 3/4" spacers.Each spline was 12' and I used a Piece of 4"PVC to soak the splines when needed. I attached 1/2" blue foam board to the splines with A.C mastic. I now have to attach Tortoise machines for tiurnouts and will use 3x3" x1/4 plywood pices attached to the bottom of the splines ,again with mastic adhesive.Since I am using code 75 Peco track ,the elevations and helix are flat. All radii are 24 and 26 ". All HO. It great![:D <br /> <br /> Joe mcDonnell]
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