First, to compensate for the elevation of Atlas track I stack 2 "1/8 inch" pieces of cut ABS. Next I screw into the ABS #4 x 1/2 flat head sheet metal screws to act as the 3rd rail chairs each spaced by the length of 5 ties of Atlas track. The screws will screw both the stack and a "3/4 inch" piece of .187 x .040 styrene which act as a simulation of the longer tie (every 5th one) used to support the 3rd rail. Next glue a 6mm x 1/4 inch heavy duty T50 staple (Home Depot) onto the styrene right next to each screw. If there is not enough space to glue the staple, cut a small piece of styrene to support it. The staple acts as the support for the protection board. Now lay your 3rd rail down on top of the flat head screw and glue. The rail is "3/32 inch" Plastruct H-beams. Next glue your protection board to the top of the standing staple using .187 x .040 styrene.
Use Gorilla super glue and perform each task separately allowing the glue to cure for a few hours. For curved track you must cut individual pieces to get the curve and possibly use 2 staples for supporting the curvature of the protection board. A single screw should support 2 ends of the rail itself.
