This quote is from the June 2024 Timetable Change thread:
But would there be demand for an additional morning service to run to Edinburgh from somewhere on the WCML to work 9M52 08:52 EDB-EUS back south, arriving around 08:30, rather than using a Polmadie set like it currently does? I would have said start it at Manchester as it can use Longsight but that might clash with the morning TPE to Glasgow. Or an additional evening Euston-Edinburgh, maybe a 20:30 departure which runs via Trent Valley to Edinburgh (extending that Preston terminator), to stable at Waverley and work 9M50 06;52 EDB-EUS, freeing the inbound from Polmadie to be used on the 9M53 10:00 GLC-EUS.
That would keep a unit free in Polmadie to work 9M53 10:00 GLC-EUS.
I think that internally the thinking is that they'd value the return of that service from Glasgow Central to Preston strongly. As discussed elsewhere, however, there's little commercial need for any of the additional northbounds to make that extra set available at Polmadie of a morning. The 0936 doesn't have the time or capacity to be calling at Crewe really either, even if to set down only. As such, it's difficult to act on at the moment but fingers crossed and all that.
But would there be demand for an additional morning service to run to Edinburgh from somewhere on the WCML to work 9M52 08:52 EDB-EUS back south, arriving around 08:30, rather than using a Polmadie set like it currently does? I would have said start it at Manchester as it can use Longsight but that might clash with the morning TPE to Glasgow. Or an additional evening Euston-Edinburgh, maybe a 20:30 departure which runs via Trent Valley to Edinburgh (extending that Preston terminator), to stable at Waverley and work 9M50 06;52 EDB-EUS, freeing the inbound from Polmadie to be used on the 9M53 10:00 GLC-EUS.
That would keep a unit free in Polmadie to work 9M53 10:00 GLC-EUS.