Hi David,
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So far, I have determined that the NX bit of JMRI will do what I need it to. I think we have Kevin Dickerson (UK-based and a MERG member, I think, to thank for that).? There will be a few hurdles to jump - subtle little things like cancelling a route by pulling the entrance button rather than by clicking the entrance and the exit for a second time. However, it looks like LogixNG has access to most of the NX functionality, so it shouldn't be too hard.
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I'll keep you posted.
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Cheers,? Nick