... to solve some of the problems I had with understanding of the data from PRR. Originally some of the dimensions didn't quite add together when drawn in CAD and I have blamed" ...prototype drawings created before the digital age to contain errors..." Well, as it turns out, there was nothing wrong with old drawings, it was just me being slow I have now updated data table in my first message and re-drawn #10 turnout/crossing in CAD to test that it all adds up OK: 2547_091827_360000000.png In red are UK equivalent terms for cross-reference. I am now ready to put it all in practice in Templot Chris Last edited on 9 Oct 2012 23:33 by bambuko posted: 11 Oct 2012 22:37 from: bambuko Martin Wynne wrote:...For accurate prototypical results you need to change to CLM unit angles after each change to the V-crossing angle (do> convert RAM to CLM) ... Martin. Martin, I have no problem with RAM ve CLM. As far as ...