There are 20 arrivals between 0745 and 0830 into GLQ, several of which are poxy DMUs. By contrast, there are 38 arrivals into GLC in the same 45 minute peak period - almost double, and with generally longer trains. The passenger numbers must be considerably more than double using Central compared to Queen Street.
In the same period, there's only a single departure GLC-EDB, compared to Queen Street's four. Given that, in my experience, most of the Glasgow-Edinburgh flow comes from Glasgow itself (with Ayrshire passengers going by car largely and East Enders like myself going to an intermediate station or driving), the station it departs from is rather irrelevant. Indeed, Queen Street is preferable being better connected to the Subway and having a better interchange for the electric lines.
And these "poxy DMUs" serve rather important places like the
City of Stirling, the large town that is (S)Cumbernauld and the affluent North of Glasgow; not to mention the low level electric services serving the West End, East End, Dunbartonshire and Monklands.
Nevertheless, this whole argument's rather pointless, as there shall be a more frequent service from Glasgow Central-Edinburgh launching in December. That will adequately serve that market. But the core Edinburgh-Glasgow service should, IMO, continue using Queen Street.
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Just guessing, but I imagine Queen Street must be quite full-ish these days?
Not as bad as they make it out to be. The normal departures are as follows:
xx:00 Edinburgh (1st stop Croy)
xx:15 Edinburgh (1st stop Falkirk High)
xx:18 Alloa
xx:21 Falkirk Grahamston via Cumbernauld
xx:27 Anniesland via Maryhill
xx:30 Edinburgh (1st stop Croy)
xx:40 Aberdeen
xx:45 Edinburgh (1st stop Falkirk High)
xx:48 Dunblane
xx:51 Cumbernauld
xx:57 Anniesland via Maryhill
Despite the high frequency of services, they're all concentrated at about the same time. There are a number of paths available between xx:00 and xx:15 (one of which may soon be used for an Arbroath local service, apparently) and the same gap between xx:30 and xx:45 (the single Aberdeen service varies a bit, but there's easily a slot in there somewhere, especially if you have the Aberdeen train leave a bit earlier).
Anyhoo... having a XC service supplement the E-G services may not work. The E-G services work on less than a 10 minute turnaround, a testament to Scotrail's fine work! A XC service would, naturally, need more (at least 30 minutes), which would throw Scotrail's diagrams into disarray and block valuable platforms at Queen Street. Furthermore, a 4 or 5 car Voyager would not meet the demands of the peak services (with all 6 cars on all trains running pretty full), and has a disproportionately high amount of First Class space for this route. I'd prefer the train to run to Central, with a call at Motherwell to reinstate this valuable commuter route for Lanarkshire.