... .box file (the files quite big) Any ideas as to how to construct this piece of P&C? What is its description? Hi Mark, It's a curved single slip. It would be very unlikely on the transition curves you have there, so I replaced it with fixed 3000mm radius curves (750ft scale) and linked transitions. The angle is 1:7.5 (a common size for curved diamonds and slips -- the 1:8 limit for fixed K-crossings applies only to straight diamonds): 2_141144_570000000.png If you add from file... this file to your own plan you will see it matches quite well. Over to you to add the upper slip road -- just follow the slip tutorial and ignore the curving. edit: Slip road added. File is now attached to my next post below. p.s. you omitted to upload the .bmp map image file. The .bgs file contains only the picture shape container for it. The .box file was so large because it contained so many unused templates -- more ...