Scenebrowser Objects or Styles = "layers", and Hide/unHide. http://moi3d.com/forum/index.php?webtag=MOI&msg=4783.2

It would be possible to show the control points for the Rails, using 3 or so pointfactory script lines... (maybe in the
same loop that creates the Rails (?).

The script output should be compared with the fortran output to see if they match, to find errors.

What about using Fillet for the edges?

The top Rail has some portion of the curve in -Y area which seems wrong?