... -crossing requires a negative radius through the splice rail, and the way to do that is to use the V-crossing from an irregular half-diamond template rather than a turnout. One where the V-crossing is flatter than the K-crossing. The adjustments can then be made using the F9 and F10 mouse actions. I've had a go at your tandem doing that, and arrived at a half-diamond with 1:15.95 for the V-crossing and 1:6.8 for the K-crossing: 2_271132_190000000.png .box file attached below. I have done some preliminary customizing on the check rails. Breaking off now because a thunderstorm is threatening and I need to disconnect the ADSL. regards, Martin. Attachment: attach_1634_2273_stuart_tandem.box 265 posted: 27 Jul 2013 22:03 from: stuart1600 Martin, As always your very quick response is much appreciated. Haven't had chance to look at your suggestions in detail, but will do so first thing tomorrow.... Regards, Stuart posted: 28 Jul 2013 00:00 from: Tony ...