... know if that is because the prototype is on such a radius (doubtful, that would be 4233 chains radius full size). More likely it has been caused by shrinkage of the original drawing. Either way it needs straightening in order to match the drawn tracks to the required radius. I adjusted the starting control template to match using the swell mouse action at the centre (using the Up Main line): http://templot.com/companion/swell_function_ctrl_f10.php It has worked out quite well, as you can see: 2_241849_470000000.png The files are attached in several following messages, if of interest. cheers, Martin. Attachment: attach_2706_3310_midland_central_2 018_07_24_2334_37.box 183 posted: posted: 25 Jul 2018 00:20 from: Martin Wynne The BGS file. SK image files to follow. Save them all with the BGS file in your \SHAPE-FILES\ folder. Then reload the BGS file. Attachment: attach_2707_3310_midland_central_1 8_07_24_2330_13.bgs 185 25 Jul 2018 00:20 from: Martin Wynne SK81 Attachment: attach_2708_3310_midland_central_1 8_07_24_2330_13.sk81 182 posted: 25 Jul 2018 00:21 from: ...