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I have found one way of doing it, which I don't think has been covered here:
I do my design two-layered; on one layer I create the elevation, and on the other I design my track on a flat plate. After that, I extrude my flat track down towards my elevation layer, making sure that they intersect. After that, I use the "Intersect faces with model" option to actually "apply" the track to my elevation layer. Then it's just a lot of work left deleting surfaces and lines, and there's no way of correcting any mistakes (not that I have found, at least).
This method is complex, yes, and time consuming, yes, but if you Really want to make a track elevated sometimes, it does give you a nice result.
Speaking of track design, I should finish up and post some myself ...
And to stay somewhat on topic: great work Purist! I've read this with great interest, and will pick up on some ideas for my future designs.
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