Stevemac
If those are grade crossings / diamonds it will may not allocate across them if the other crossing track is allocated, and will not allocate across an occupied? block.
As you are using everything auto generated the mast at the end of the last allocated section has a hold aspect.
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To check whether the signalling is the problem, see how it runs with "No Signals" in the dispatcher options.?
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Steve G.
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