in reply to Closed geometry: a train track problem
Ah, you're peering into The Abyss. (Unless you're a lot smarter than I, which is very possible, maybe even likely.)
I've thought about the same thing, and had some good responses here:
Re: If I had a Free Two Months...
I think I can do 'regular' pieces, but switches that can be flopped over to switch right or left, and valid 'cross-overs' (ie: over-bridges) v. invalid collisions just make my brain start to smoke.
Best of luck. If you make progress, please share it here on PM. This is a *great* problem.
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Seekers of Perl Wisdom