... :23 from: Martin Wynne Andy G wrote: To be honest the example I gave was simplified to avoid confusion, we are using transitions Hi Andy, Ok, if you use transition curves you can create the track separation quite easily using transitions only. Set up the straight double track at 6ft way and some curved double track at say 8ft way or whatever. Then use the make transition function to link them, separately for each track. Here's what I mean, with the amount of widening exaggerated for clarity: trans_widen.png trans_widen_spacing.png You will find the outer transition zone is much shorter than the inner, and approximately centred within it. For large increases in spacing this method falls down, as either the outer transition length reduces to zero, or the inner transition becomes excessively long. You then need to apply slews instead, as explained before. regards, Martin. posted: 7 Apr 2009 17:48 from: Andy G I think that is how I've done it. Doing it automatically would be nice but at least I know I approached it ...