by barnez » Tue Jul 02, 2013 2:34 pm
Are you asking about converting a previously laid section of double track?
If so, this is extremely difficult, unless the track was originally put down with easements.
If you are asking how to lay new double track for super-elevation: in general you must use the track tool to lay both lines simultaneously. The radii of the curves will differ slightly so copy/ paste will always result in a misalignment coming out of the curve.
Keep in mind that any curve that is to have super-elevation needs easements or the track will be rendered with (and be simulated with) a nasty kink.
-barnez