... guessing the hv in your file name is either High Voltage or Holborn Viaduct? My telepathy machine has had 20 years experience on here. There are excellent 60"/mile maps from the 1890s available for that location. How are you planning to build this? Fully chaired or copper-clad? cheers, Martin. posted: 27 Mar 2019 13:56 from: Martin Wynne Hi Geoff, I have imported the NLS 60" map as a background: 2_270839_160000001.png I notice some differences between the map and your plan: 2_270839_160000002.png At A the alignment and switch positions differ. At B the original curving is sharper than your design. I used the georeferenced version of the map. Did you use a different version of the map, or maybe the original single sheet version? Georeferencing does change the curvature. Or maybe some other railway map or track plan? Or are the differences intentional? You referred to a tandem turnout, but I'm not really seeing that. What I'm seeing is an outside slip. It doesn't necessarily make any difference to the ...