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Well, I was considering the center of the rails for my measurement. For my computer simulation, a rail exists as a bezier curve, with each piece of track being determined by a few points. ndpbrr: Yeah, I tried that early on... no matter how carefully I determine the size of the tracks, I cannot duplicate any of these layouts here: http://www.thortrains.net/marx/kdlaymth.html When I try to, I *always* end up with some overlap. I guess what I'm most worried about is that a train layout cannot exist with a splitting diagonal without some bending or stress to the tracks in the real world that's not possible in a computer program unless I make every piece of track act flexible. Not something I wanted to do, initially.
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