I think "no paths available" means that the timetables planning rules (for example, https://sacuksprodnrdigital0001.blob.core.windows.net/operational-rules/Operational Rules/TPR 2025/V3/TPR 2025 V3 NWC.pdf) won't allow more trains to be "timetabled" in order to allow the timetable to be robust (and the 2018 experience showed that even that wasn't the case) but running extra trains will always be possible at a potential cost, they're two different things.We're told there are no spare paths between Stockport and Piccadilly yet the Hope Valley locals have been diverted via Stockport.
In the infamous 2018 timetable there were trains which didn’t stop at Stockport, or omitted only one of Levenshulme or Heaton Chapel, which was presumably to squeeze the trains into the timetable in compliance with the rules, so although the rules will be enforced they sometimes lead to a bit of nonsense in reality on the ground. The revised timetable since 2018 has removed these quirks.
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