notadriver
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- 1 Oct 2010
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I think it depends on local instructions and company policy.
Yes GwR safety case didn't allow for drivers to exceed 100mph on the 2+4 HST Castle sets even though a short stretch of 110mph existed between Bristol and Taunton.I think it depends on local instructions and company policy.
If they were, they didn't work.Were speed limiters ever fitted to the 225 sets to prevent excesses over 125/126mph?
Next to no chance. All timetable and performance modelling is done by computer these days.Is there any chance that with all the testing they might find that any performance benefit is so negligible, they might as well have the full sets and be done with it !
They have an ASL - Automatic Speed Limiter, I.e. set a speed and the micropressors will adjust motor current to maintain it, but there's nothing to prevent it either not being used or being set to the maximum figure - 150mph.Were speed limiters ever fitted to the 225 sets to prevent excesses over 125/126mph?
Next to no chance. All timetable and performance modelling is done by computer these days.
Thanks. Same as the Class 90s that I am more familiar with.They have an ASL - Automatic Speed Limiter, I.e. set a speed and the micropressors will adjust motor current to maintain it, but there's nothing to prevent it either not being used or being set to the maximum figure - 150mph.
Capacity is being wasted transporting a smattering of passengers to/from Bradford and Harrogate. Without these daft extensions, they could strengthen the 5-car services.I think the five car diagrams in the slots they're in would not be posing any issues at all for Leeds if the movement from near half-hourly towards a 'half-hourly and one extra every two hours' had been kept. This would have called for a second Leeds - Doncaster service too.
Of course there were sensible reasons this wasn't kept, but unfortunately the rolling stock strategy can only flex so far. Capacity has been allocated away from Leeds and towards Newcastle. Of course, given the prices, this is also great for revenue.
Anyone got any updates on this? I've found the diagram below, and really hoping it'll mean 91s to Newcastle, but am conscious that the quoted post was made after these diagrams were shared, so things could've changed.As had been covered to death, this will be ran by an Azuma off the Harrogate departure at the same(ish) time, with the Harrogate & back cancelled to provide the stock. No 91s to Newcastle for now

As mentioned above, the use of a 225 set on this diagram is postponed until at least March, if it even goes ahead at all I'm afraid.Anyone got any updates on this? I've found the diagram below, and really hoping it'll mean 91s to Newcastle, but am conscious that the quoted post was made after these diagrams were shared, so things could've changed.
Image shows Diagram NL 403 SX 225-7 from 15/12/2025 15/05/2026, one of the legs going to/from Newcastle.
View attachment 193066
https://www.whatdotheyknow.com/request/dec_2025_may_2026_unit_diagrams#incoming-3156962
Very unlikely to see them to Newcastle nowThis morning , RTT reports the 1A04/09/13 1Y00 IC225 diagrams worked by 7-coach sets.
If the "gen" is correct, then the Monday 1st December 1A04 diagram set worked by 91130+NL17 closes 9-coach IC225 operation.
The next "gen" is the timetable change to include KX to Newcastle IC225 working, some experts are predicting those Newcastle workings will be postponed
Indeed, but surprisingly they are running nowVery unlikely to see them to Newcastle now

That certainly looked the case in December, glad to see them back nowIndeed, but surprisingly they are running now![]()