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Stagecoach have been running E400H’s through Stanley Green business park under route 0 with staff members on board, which the 312 currently runs though en route to Handforth Dean. I’ve not seen a confirmation of operator yet but this may offer a hint.
edit: Stagecoach have indeed been confirmed...
https://www.independent.co.uk/travel/news-and-advice/northern-rail-franchise-grant-shapps-cancellations-train-fares-a9267261.html
edit: amended with correct quoting as per mods, I’d incorrectly used indented text.
This initially sounds promising but sadly will likely not result in any sort...