So it's been a really long time since I've actually done submitting on the forum, but I've come up with a good one. Because NL is hiding the screenshots I tried to take, here are a couple of pics from sketch-up. The 3D's are junk and are there just for reference, but TheArchitect has accepted the project and undoubtedly his will be much better.
But for now, the pictures get the idea across. And please don't give me crap about the shaping, it's just a free-form track.
Before it is asked, the whole track passes tunnel tests (within reason)