I like busters support technique, I'd never tried that before, I just tweaked using 3d view and top view making, using the pixels on the node handles as a guide to how straight the track was. I find that the easiest way and it takes just as long to do that for me as it takes to do any other section of track, whether it be on a gridline or not, that doesn't mean that anyone else would find this method easy .... IF certainly doesn't