This turned out to be a really timely post, it made me re-evaluate my layout in progress and I realized I had some problems with curve spacing. One curve is going near a collumn, and I realized it was too close for comfort. I also by using some small straight sections in the right place was able to get the center to center distance up to 4.5-5", so that should handle anything I would likely have (not planning on mega engines with huge overhang, but who knows?).
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