I wouldn't personally go that far just yet

but maybe in the future! Meanwhile I have been thinking to myself whether a Class 93 would be viable, based on the 92 but with a 50/50 engine with 50% electric power and 50% diesel power, maybe not designed for freight work but something that could haul the sleeper and use electric until the wires end then switch and have enough power to make it to its destination (I wouldn't suggest the Class 88 be the best choice for that category given it's specs). Of course, I'm talking about a replacement to the 57's on the GWR Night Riviera... and apologies if this has gone off topic, feel free to ignore if you want to keep this on topic. Just an idea...
A bit off topic, but as you mention it... I think the issue with the Caledonian Sleeper at least is you'd need something capable of hauling a 16-coach rake of ETS-hungry Mk5s under the wires, then with a big enough diesel unit to haul (and heat) 8 of them up steep inclines in the winter in Scotland. Also the Highlander CS as it currently runs splits into 3 at Edinburgh, so you need to bring two more locos into the equation anyway. It'd probably be more cost effective to electrify Edinburgh-Inverness and keep the electric loco on that portion (that's definitely a different thread - and I'm sure electrification of that route has been mooted and on the back-burner as costs don't stack up).
GBRf have the 15-year traction contract for the CS and have put a fair amount of money into the 92s and 73s - I can't see them changing track and looking at dedicated bi-mode locos unless something major happened. And let's not forget the 92s were £3m-a-go locos designed (in part) to haul sleeper trains...!
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Correct. 92014/023/033 have been completed so far, with 92018 at Brush being done. 92028 is also at Brush but not clear what's happening with that one as it's been there ages..
Yes, 92028 is an interesting one. Not in the official sleeper pool, but did a bit of sleeper work (in it's old Railfreight/Europorte grey livery) in the very early stages until it had a rather major failure two weeks into the contract. It was then painted into the GBRf Blue/Yellow similar to 92032, but been in Loughborough since I think. Maybe there's just been no need for it hence no rush to get fixed (or it's majorly broken - but then why repaint it?). Perhaps with the new China clay workings GBRf have just won we may see it back out soon...?
92010 is also interesting in that it seems to be doing fine (and being relied on) without the mods. Maybe it's just got lucky, for now...
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Believed to be a DSD fault on 90048. So a safety system fault stopped the loco working. Not necessarily reliability.
I understand your point, however a fair few of the CS 92's issues were from over-zealous "safety" systems (e.g. lower tolerances due to it's Channel Tunnel design to power variations from the OHLE resulting in them "tripping out" and shutting down). Ultimately, whether it's mechanical or a safety system or software, if a loco won't move forward when it should and (badly) delays the service it's operating (and many others behind it) I'd say it's a 'reliability' issue in the broadest sense.