... 9.53 degrees, half that is 4.76 degrees, so multiply those spacings by cos(4.76) i.e. by 0.9965. Not many modellers would go to that level of precision and be confident of building it. I also set a GWR B switch, generic type V-crossing and CLM angle. This gave the lead to fine point as 230.95mm on the model at 4mm/ft. The GWR dimension for a B-6 is 57'-9"= 231mm on the model, so that's a good result: 2_211749_370000000.png Box file below. Note that I haven't looked at the wing and check rails or the wing rail front spacings -- over to you. regards, Martin. Last edited on 21 Jan 2012 23:29 by Martin Wynne posted: 21 Jan 2012 23:40 from: Martin Wynne Here's the .box file (Sorry, I posted the wrong one earlier). Attachment: attach_1329_1796_gwr_b6_for_paul.b ox 255 posted: 22 Jan 2012 19:29 from: Paul Boyd Hi Martin Thanks for that detailed explanation. Like I said, ...