... starting gap, so the shorter will be the resulting transition zone. If you can post a screenshot here or attach a .box file, it's much easier to advise. regards, Martin. Hi Martin, Thanks for the quick reply. Attached (I hope) is the box file of where I've got to so far, the transition curve should be using dummy1 and dummy2. I've made the two dummies full circles to make sure that they don't overlap, but however close they are, I can't get what I need. 2341_011458_350000000.png The above should show how the curve ends up. I can vary the start and end points of the transition, but I can never get the] anywhere near where it needs to be. Once that is done, I'll want to put another one around the outside of that. Adrian Attachment: attach_1408_1837_station_demot_201 2_03_25_1404_03.box 399 posted: 1 Apr 2012 21:48 from: Martin Wynne Hi Adrian, What you are trying to do won't work like that. The curves come closest within the turnout, i.e. outside the plain ...