Looks like the timetable change has just been confirmed for December 2025, and there's a joint TOC website as well.
www.lner.co.uk/news/more-seats-and-quicker-journeys-as-new-east-coast-main-line-timetable-given-green-light/
A late thanks for this!
Thameslink 9Sxx have reduced dwell time at Finsbury Pk Northbound making journeys slightly quicker
One thing that has not been commented on so far is the general retiming of the down service onto the branch.
The Kings Lynn/Ely trains now depart at xx54/xx24 off peak and xx48/xx18 peak. The down Kings Cross-Kings Lynn time is down to 101 minutes, much nearer to what it used to be 20-25 years ago.
The down stoppers are back to xx06/xx36 just like the old days.
I think this means that up Kings Lynns will form down Kings Lynns, up Elys will form down Elys and up stoppers will form down stoppers. For those that get worked up about class 700s to Ely and Kings Lynn, it looks like you have only got to put up with them until December 2025.
The Brighton trains are only moved slightly. The slightly earlier arrival at Cambridge is just as well as the return trains start a bit earlier from Cambridge at xx21/xx51.
What a strange timetable it is southbound with Knebworth gaining a call on the Peterborough service, it looks like they just can’t get it to slot together. From a personal point of view, I will probably only use the Sevenoaks services now as I suspect it will be more reliable then the Letchworth and if we are going to need to put up with class 700s, might as well get on at the beginning.
How to serve Knebworth and Welwyn North in the peaks has been an issue for a long time. In the 2009-18 timetable they were served by random calls in Peterborough and Royston trains, at least this has some consistency. What calls where is down to pathing between Hitchin and Digswell. We can't see from the information available but I suspect that the Cambridge-Kings Cross semi-fasts are booked on the up fast from Hitchin South which precludes a Knebworth call.
Looks pretty negative for GN users to be honest.
Not sure what is the logic of a Letchworth to King’s Cross stopping service. The current fast peak services (only just reintroduced after Covid) are popular as they give Letchworth and Hitchin a fast service where there are plenty of seats available. Meanwhile the stopping services give connectivity around Hertfordshire towns. Both these features will be lost.
Not sure what’s the point of having a service that calls at all stations from Cambridge, doesn’t directly connect to the likes of Welwyn and Hatfield, but still isn’t as fast at reaching London as the Cambridge/Brighton service.
By far the most important flow to/from the branch is Kings Cross-Cambridge. The Kings Cross-Cambridge peak semi-fasts are about providing more capacity on this priority. Their end to end timings are almost exactly the same as the Thameslink Brighton trains to/from St Pancras at 68-69 minutes. During the peaks there will be "no overtaking" in the peak am Cambridge-London and pm London-Cambridge flows.
I don't know where the traffic comes from (it may not be North of Letchworth) but a reasonable number of people get off at Welwyn Garden City and Hatfield from the ex-Cambridge trains in the peak. I am sure they won't appreciate the change. I would be surprised if Royston - Hatfield (for the university) flows didn't exist.
I have looked at the data, with thanks to the people here (
https://railalefan.co.uk/labs/flowstats/).
The most important flows not involving a London station are (I'm quoting 'one way' figures which is how they are presented in the source):
Stevenage-Hitchin 177680
Royston-Cambridge 143627
Hitchin-Letchworth 105132
Stevenage-Letchworth 103674
Hatfield-Welwyn GC 66905
Meldreth-Cambridge 65699
Hitchin-Cambridge 62427
Potters Bar-Hatfield 61714
Welwyn GC-Stevenage 59308
Stevenage-Cambridge 51789
Letchworth-Cambridge 48008
Hatfield-Stevenage 44917
Potters Bar-Welwyn GC 44551
Cambridge-Hatfield is 13145 and Cambridge-Welwyn GC is 10568.
The flows Royston/Baldock-Welwyn GC/Hatfield are all less than 4k. These are not completely neglected with an 0703 ex Royston starter (0715 from Letchworth) and 1757 ex Kings Cross going through to Royston. One oddity, which may be an error, is I can't find an 1827 Kings Cross-Letchworth.