As things currently stand, there's one big fleet of EC stock, so a service from Edinburgh/ Newcastle/ York to London may work the next northbound service to West Yorkshire.
You'd need to jig the timetables around a bit to create diagrams where a 90 could perform (i.e. nothing long distance/ high speed).
Surely some services, like the (now southbound-only) Flying Scotsman, are timed for
INTERCITY 225s, which accelerate quicker than an
INTERCITY 125? Simarly, the Aberdeen and Inverness service would be in trobble if an IC225 ended up on one. The diagrams might all include long-distance runs, but it can't be 'one big fleet of EC stock'.
Yep, just checked the sectional appendix and its 125 on both the up and down fast from eastfields all the way to stoke, no 140 in the SA
Assuming that's a current sectional appendix it would say 125mph wouldn't it. I think we all agree that 125mph is the current limit, and has been for some time. The question is whether, at the time of the early testing and introduction into passenger service, they were ever permitted to do 140 in passenger service for a short time, even if it was just one or two trains given special permission to do so due to late running.
91s lost their 140mph ability when the safety case was updated following HGR (when they were renumbered as /1s).
I took a close-up photograph of the info-sticker on the 'Battle Of Britain Memorial Flight' class 91 (91110 I think) when it was at Railfest in NRM York.
It says 140mph. That suggests to me that they haven't ever done anything to them that they think will compromise the 140mph ability, but maybe they haven't done the testing to prove it's still ok. There's no need for it right now anyhow, not until ETCS (or other cab-signalling system) is installed.
Largely irrelevant anyway as they won't ever run at 140mph.
Both the ECML and the GWML (the latter being the best place to cascade them to if they are withdrawn from the ECML, in my opinion) are scheduled to have ERTMS installed. If the IC225s are kept running (and I really hope they are, if IC125s can be life-entended until 2035 (60 years old I think that'd make them) then lets have the same with the IC225s) they may well finally get the chance to run at 140mph again.