... is the smallest. According to the various turnout settings, and the main road curving, it could be any of them. However, the switch radius is not usually smaller than the turnout radius. In some turnout sizes, called natural turnouts, it is the same as the turnout radius. These sizes are A-7, B-8, C-10... Here is a case where the smallest radius is in the main road. This might be the inner turnout in a curved crossover for example: 2_260858_500000000.png More info and diagrams for other types of V-crossing are at: http://templot.com/companion/real_track.php cheers, Martin. posted: 26 May 2020 13:47 from: Graham Long Thanks for your reply. I understand the mainroad and turnout radii. My query related to a mention of minimum radius unrelated to these radii that was found somewhere in the info window. I was just playing around with programme and did not keep it. I have done a another template and this time the turnout radius ...