To be fair with the luggage space concerns - many of the routes that the HSTs will serve will also have a substantial increase in capacity. For example, the HML will eventually go hourly and there will be a new Arbroath/Dundee to Glasgow stopper service which will help spread the load.
Not making excuses though, since the plans suggest that there has been a few shortcuts taken and the space doesn't seems to be fully utilised, so hopefully the criticisms will be listened to.
I'll take your point about services spreading the load of luggage, but I think the problem stems a bit wider because many passengers going to Inverness from Edinburgh and Glasgow often switch to Perth, as services will be hourly from there. As Inverness passengers typically have more luggage, this clogs up Aberdeen services as well as already adding to the capacitated Inverness service they connect to. In my opinion, the additional services which will see a half hourly frequency to Perth will only entice Inverness passengers to change there, rather than waiting longer in Glasgow for the next Inverness services. This would continue the existing trend of Inverness passengers clogging up Aberdeen services, as well as the connecting Inverness service which is near full most of the time into Perth. Maybe a tactical approach to the fares could solve this?
In the short term there are depot problems preventing wider use of 5 car sets. Adding a dozen or so Mk3 trailers to the fleet will not be a problem if passenger numbers do rise well above expectations.
Although there are hundreds of Mk3s across the country, most of which are due for replacement and the inevitable scrapping which comes with it by 2019 - so wouldn't Scotrail have to move quickly to secure additional carriages before those currently in operation post-2019 become the majority? What's the chances of rolling stock companies retaining a number of Mk3s in anticipation of Scotrail (or any other operator like XC) wanting to lease further coaches?
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