from the rails and rail
        
        
          joiners are generally
        
        
          run above the board,
        
        
          eliminating the prob-
        
        
          lem of drilling through
        
        
          the door panel. The
        
        
          wires are held in place
        
        
          with quick-tack glue,
        
        
          and will be eventu-
        
        
          ally hidden with both
        
        
          paint and ballast ,and
        
        
          other scenery.
        
        
          
            Layout
          
        
        
          
            construction
          
        
        
          I cut some of the ply-
        
        
          wood into 8”-wide
        
        
          strips, six of them 4’
        
        
          long each. Cutting off
        
        
          the 4’ ends is easier
        
        
          for me to work with
        
        
          and to cut with my
        
        
          hand saw. I also cut
        
        
          one 4’ strip 2.25”
        
        
          wide and three at 1”
        
        
          wide. The first set will
        
        
          become the shelves
        
        
          when laminated to double thickness. The last narrower strips
        
        
          are the roadbed. The wider roadbed is for the double-track
        
        
          sections, and the narrower is for the single track.
        
        
          These are then laminated in an overlapping fashion over the
        
        
          previously laminated shelves. The shelf brackets are attached
        
        
          through the drywall into each stud, such that the resulting
        
        
          roadbed surface was level with the door panel top surface.
        
        
          10. This sketch shows
        
        
          construction details of the
        
        
          bridge.
        
        
          10