... you are doing without an image in the way, and panning and zooming are much faster. For a hand-drawn plan it is often a choice between nice smooth curves, or matching the plan exactly. The usual way of working is to align a couple of dummy templates of fixed radius at each end of a section, and then use the make transition function to create the curve between them. You didn't upload your image file, so I have worked roughly over your screenshot. First the sketchboard view for clarity: 2_041351_540000000.png 2_041236_330000000.png The two dummy templates are in white. These can now be deleted once we are happy with the S-curve transition alignment between them in red. On the left the radius is 1100mm, on the right between the platforms there is an opposite curve of 20 metres radius. The new template in red can now be extended at each end and will follow the original templates to whatever length we need, and double track can be created off it. More about aligning dummy templates here: http://templot.com ...