What is the maximum viable length (post Queen Street work)- 2+6?
2+7 almost certainly wouldn't give sufficient acceleration. 2+6 should be ok though and obviously lengthening the 2+4s to 2+5 would be the obvious thing to do first.
Aside from the detail on Queen Street, the stations that'll be served by the HSTs don't tend to suffer from very short platforms.
The only one that I can think of off the top of my head - they can't stop a 3+3 170 at Newtonmore.
It may be obvious, but the only lengthening in the franchise agreement is to create two six-carriage sets in 2022, with one fewer four and five carriage sets. Unless there is gross overcrowding, I don't see this changing until the next franchise.
I personally don't think there will be huge capacity problems either. But if there are then it should be fairly easy to do so, subject to Transport Scotland and Scotrail agreeing terms on who would fund the additional coaches.
Could a private company potentially fund extra coaches on a revenue sharing or exclusive use basis?
There is a history of this with Stagecoach leasing coaches to be hauled by the sleeper about 25 years ago.
I personally don't think there will be huge capacity problems either. But if there are then it should be fairly easy to do so, subject to Transport Scotland and Scotrail agreeing terms on who would fund the additional coaches.
The coaches are full of people like me with bus passes (in Scotland the bus pass includes coach travel). And the overcrowding would be eliminated, I hear, if more trains either didn't stop before Perth, or at least stopped at Stirling to pick up only.
Not stopping until Perth would help, however last Wednesday the Edinburgh to Inverness afternoon train it was rammed until Pitlochry with people standing. Folks from the Glasgow train got no seats when joining at Perth. Conductor says this is a regular occurrence.
So I think the extra capacity of the HST will be welcome, but a fair part will be be used to cover the overcrowding. Your point about OAP's on buses is a good one, they do tend to fill the buses.
If Stirling stop was emitted then there would be no fast service .
If Stirling stop was emitted then there would be no fast service .
To be fair they never said seven cities on one train.It would be somewhat usual for the 'seven cities' service not to call at one of those seven cities

To be fair they never said seven cities on one train.![]()
It would involve a convoluted route.... Glasgow-Edinburgh-Stirling-Perth-Dundee-Aberdeen-Inverness....
Stirling will receive extra fast services come 2018 anyway when the new Dundee hourlys start running, so omitting some HST calls wouldn't do too much damage.
It isn't really. Class 170s and indeed 158s are both permitted to travel at HST differential speeds as indeed were the 47/7 push-pulls back in the late 80s. So the journey time decrease will mainly be down to fewer stops and greatly improved acceleration.
There will be one good thing about the 4 coach sets they'll be pretty nippy!
There will be one good thing about the 4 coach sets they'll be pretty nippy!
Technically, yes.
HSTs aren't the quietest beasts in the world. Scottish local authorities have issued noise abatement orders to rail operators before.

There's a certain irony in a blind person complaining that the door alarms are too loud!More concerning is the door sounders which seam to get louder an d louder.