>may not allocate across them if the other crossing track is allocated
Doh, of course that would be prudent. That only happened in pic 2 ?because I kept clicking allocate next to see if it would make it.
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I tried using "no signals" and there was no issue so I conclude there's no faulty SML. Then I tried with SML and it worked for many cycles until I was convinced there was no problem. Maybe there was "self-healing" after several quit/restarts?
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I may have to divide a block into two on that transit because the layout is tight and allocating 3 sections goes around and spans two sides of the level crossing. Thanks for giving me ideas.