Parametric Railway Turnout

After having produced the [parametric railway straight rails and curved rails](https://www.techmonkeybusiness.com/articles/Parametric_Railway_Tracks.html), something nagged at the back of my mind for quite some time. It was the need to produce a set of points or turnouts. I kept putting it off with the promise that maybe I’d just model them directly and that would do. I knew it would be tricky. It was. The tool presented here is **not** an all-singing-all-dancing turnout, but rather the 90% of the way there model. The remaining 10% you will have to do with a modelling package or CAD program. The reason for doing it this way is that there are far too many options to try to come up with a truly parametric solution for the pivots and methods of controling the switches.

The OpenSCAD model presented here produces a left hand turnout. If you need a right hand turnout, all you need to do is create a mirror version of the one produced with this tool using your favourite modellin