Depends where you are coming from. If south/west then yes, But North / East / West End is easier into Q St. North North West, same difference via Partick on Low Level Lines. And Queen St is better for coach station connectionsI think the FSR service takes a bit longer than 29 minutes!
For example the 0900 from GLC got to EDB 1002 (3 late, after being 5 late at Midcalder Jn). The 0900 from GLQ got to EDB at 0950 (also 2 late).
So yes, you could get to Edinburgh 12 minutes earlier but Central is more conveniently located
Maximum 5mins. And whilst not blessed with the grace of Central (blame the planners for allowing the concrete block which houses SPT), Queen St is a very efficient clean and bright station.and it would take about 12 minutes to walk from Central to the dump that is Queen Street anyway, so it's not really faster for most people.
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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.
The problem si 2 lines feeding 7 platforms thus meaning many crossovers in the entrance, and this can block entry / exit for a period. Hence the flighting. During the 'empty bits' you will often find several arrivals.
The only way I could see XC working would be if they build the Kelvinhaugh turnback and XC traveling via A&B. The issue will be catching up with stoppers.
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The new Caledonian Express from Edinburgh - Central Limited Stop could be arranged to leave from the Glasgow end of the through platforms at Edinburgh (currently used by the thru services to GLC anyway) thus at best it could be a same platform transfer.