Assuming there are no issues with contiguous blocks, sections verified, and real/virtual signals (if used) working, then:
Each train should have its own transit, even if each follows the same route.
Two trains cannot use the same transit at the same time.
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As a rule, I always use a traininfo file and transit pair to define a unique train run.
That keeps things from becoming confused.
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Mostly I use each run as "to safe sections", especially when I have passing movements.
For reversing movements on the main, I sparingly use "as far as".
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I can't stress enough that you treat each train movement as choreography.
Walk each movement through logically and in concert with every other train's interaction.
Automation is more of a dance routine than just pressing the "go" button and watch what happens.
--
Ken
NYNH&H, Old Colony Division, Cape Cod Branch (1949-1959)
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Ken Heywood