Doing nothing was always an option.
ScotRail didn't *need* to get new stock. Unlike some franchises, it wasn't as if the trains on the "Seven Cities" routes were becoming life expired (e.g. the franchises that took over stock which included Pacers) or redundant due to things like electrification (e.g. EMR were unlikely to retain all of the 222s when the line to Kettering/ Corby was being electrified).
There were going to be a few 170s freed up by Central Belt electrification that could have provided additional capacity on the Edinburgh/Glasgow - Inverness/Aberdeen services - so it would have been feasible to stick with the existing DMU fleet but with six coach diagrams for the busiest services.
The argument against 170s often comes down to the wide doors opening at Aviemore in midwinter, which I accept isn't pleasant but they were 100mph trains running routes with maximum speeds of 100mph, and could be interworked with the Fife Circle/ Anniesland / Tweedbank etc (in a way that the HSTs obviously aren't) - they were fine for the roles that they had.
Obviously they could have looked at something like an 802/810, if they wanted to push the boat out a bit more, and I'm sure some people will be along to nominate their favourite stock etc etc (or maybe trying to take on some modern cascaded stock from elsewhere in the UK), but I think there was something to be said for keeping the two big fleets of 158/170s (around fifty of each, IIRC, pre-electrification), rather than the smaller fleet of 158s/ smaller fleet of 170s and a couple of dozen HSTs
I accept that the HSTs have a bit more "status" than a 158/170 (and maybe there's an element of vanity in ordering these 125mph trains) but I'd have been fine with keeping the existing fleet and using the units freed up by electrification to beef up capacity.
More focus should have been on things like electrifying the Fife Circle/ Anniesland/ East Kilbride etc, rather than replacing the fairly modern Turbostars IMHO
This is pretty much how I see it.
From reading a lot of earlier introduction thread, and looking at other snippets, (and I may well be wrong), the only Turbostars that ScotRail were due to lose, were the ones that ended up with Southern.
Isn't that 8 units in total? How many ran the E&G services? More than 8. So a post-electrification net gain.
I understand the leases were still available for the ones that have since gone to Northern when the franchises were re-bid. Didn't the other bid from First not look for more of the same?
I don't get the love for the HST these days. Fine when I was a kid, and they were new. Now? The ones I've been on are creaky, and not particularly easy for boarding.
The underfloor engines of the Turbostars don't bother me in the slightest, the seats are decent, cabin is airy, and much, much easier to board.
I can't comment on the re-training costs for train crew, and maintainers, but that's a cost that could well have been avoided with the retention of existing stock, and ploughed back in to other passenger improvements.
There's an emotional attachment, maybe even a prestige element that wrongly swung the bid to the 125s.
Having to use these (admittedly not as much as pre-lockdown) for at least another 10 years is a very poor decision to me.