Would be great if it happened - free up a couple of paths through the Queen Street tunnels if the Cumbernauld services ran onto the low level.
Presumably the low level line can accomodate a lot more than the current four/ hour - there shouldn't be any capacity problems east of Partick?
On a related note - I take it the Airdrie - Bathgate EMU service will be an "all stop" extension of the current Airdrie service (and not a "new" service between Glasgow and Monklands?
There's been talk of a turnback siding at Yorkhill but it's not been built yet. This
would allow services from the east to terminate at Queen Street or Charing Cross.
A Cumbernauld - Charing Cross service, for example, would suffice as a replacement
for the Cumbernauld - QS High Level service, though it may be slower if the trains
stop at Alexandra Parade, Duke Street, Bellgrove and High Street.
It leaves me with a concern for Springburn though. It's not beyond the realms
of possibility that it could close entirely. The once-mentioned Northern Circle (QS Low
Level - Bellgrove - Springburn - Ashfield - Maryhill - Anniesland - Partick - QS Low
Level) might be a replacement though it would require reconnecting the Maryhill
chord at Anniesland, and electrification of the Maryhill line.
Pie in the Sky suggestion. Queen Street Low Level prior to electrification had 4
platforms. Reopening them would allow services to terminate there in both directions.
I don't know the service pattern planned for Airdrie - Bathgate. I would assume
the services currently terminating at Drumgelloch would continue through to
Edinburgh.
James H