... . However, I think you are looking for a "geometrical fit" here, i.e. tangency between the two radii. So the dimension you need to watch in F5 is the external geometrical radius (substitution radius) at the bottom of the info panel. Also, having set this (it turns out to be a D-11.48, say D-11.5), you must extend the approach track to the tangency point (EGTP), which in this case adds an extra 3 sleepers to the switch front: n_for_andrew.png There is a video all about substitution radius in the video list. regards, Martin. posted: 4 Jun 2009 10:26 from: Jim Guthrie My senior moment is forgetting about curviform I did get similar results to Martin by inserting a turnout in a 355mm curve with a curviform 1:11.5 crossing. Jim. Parts of Templot Club may not function unless you enable JavaScript (also called Active Scripting) in your browser. Templot Club> Forums> Templot talk> N Scale Curved Turnout about Templot Club Templot Companion ...