... 1853_151110_270000000.png posted: 15 Sep 2011 17:26 from: Martin Wynne Hi Brian, It's the radius in the rail, which Templot matches exactly: gauge> other gauges...> set exact scale...> 4mm/ft geometry> straight template> switch settings...> 12ft straight heel switch template> V-crossing settings... generic crossing, 1:8 do> convert RAM to CLM The result shows the turnout radius is 2376.32mm. Dividing by 4mm/ft= 594.08 ft. 2_151223_570000000.png Unfortunately the lead length (minus the 12ft) is not quite so accurate. You will find this often on old drawings that it is impossible to reconcile all the dimensions using modern methods. regards, Martin. posted: 15 Sep 2011 19:55 from: Brian Nicholls Hi Martin, Many thanks for the very quick and detailed response, that certainly does answer the basic question I asked, however, as is usual with me, it often leads to a raft of other questions. Q1. For example, I've ...