... I can make a close copy at 1:48 scale. From past experience that is very hard work with Peco designs. It is much easier to start from the prototype. The radius dimensions quoted by Peco are generally the substitution radius, and don't correspond to the actual radius in the rails. regards, Martin. posted: 27 Aug 2014 16:17 from: Martin Wynne Hi Keith, This looks close. I suspect it is the same rail parts as used in the 00/H0 small-radius turnouts: 2_271109_280000000.png 1:48 scale, 16.5mm gauge, 1.25mm flangeway, rail-head width 2" scale. 12-degree crossing angle (1 :4.7), enter k12 in the dialog. regular V-crossing. custom curved switch: switch lead: 137" full-size switch offset: 10.75" full-size switch radius 2832" (236ft) full-size I think you may have gone wrong in measuring the offset -- it is measured from gauge-face to gauge-face. I will tidy ...