Major disruption between London and Stevenage expected until 14:30
Service alteration details
Incident reported: Wednesday 26 August 2026 at 11:46
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Last updated
Wednesday 26 August 2026 at 12:50
Train operators affected
Route(s) affected
Grand Central between London Kings Cross and Bradford Interchange / Sunderland
Great Northern between London Kings Cross and Letchworth Garden City / Royston / Cambridge / Ely / Peterborough / Kings Lynn, and also between Moorgate and Welwyn Garden City
Hull Trains between London Kings Cross and Beverley / Hull
LNER between London Kings Cross and Lincoln / Hull / Leeds / Bradford Forster Square / Skipton / Harrogate / York / Middlesborough/ Newcastle / Edinburgh / Aberdeen
Lumo between London Kings Cross and Newcastle / Edinburgh / Glasgow Central
Thameslink between Sevenoaks and Welwyn Garden City, and between Brighton / London Kings Cross and Cambridge, and also between Horsham / London Kings Cross and Peterborough
Description
A person has been hit by a train between between Potters Bar and Welwyn Garden City. Whilst the emergency services carry out their work, all lines between these stations are closed. As a result, trains between London and Stevenage will be cancelled, delayed by up to 60 minutes or revised.
Major disruption is expected until 14:30.
A visual disruption map video is available.
If you've been affected by what happened on the network today, there is always someone to talk to. You can contact the Samaritans on 116 123 from any phone for a confidential chat.
Grand Central customer advice:
You can use your ticket at no extra cost on the following alternatives:
LNER between London Kings Cross and York (Please note, this train operator is also affected by this disruption)
Northern via any reasonable route
TransPennine Express via any reasonable route
Great Northern / Thameslink customer advice:
We've recently been told about this. Your journey on Thameslink and Great Northern services in this area is likely to be severely disrupted. We're working to gather more information.
We don't have an exact estimate for the delay at the moment.
It's likely that you may need to use another route, and we'll let you know more details shortly.
You'll be able to see any further updates on this page, so please continue to check back here.
Changes to services
The following alterations are expected to the normal timetable:
Thameslink and Great Northern services between London and Stevenage will divert via Hertford North where possible
Thameslink services which run between Brighton and Cambridge will be cancelled
Thameslink services which run between Peterborough and Horsham will run non-stop between East Croydon and Gatwick Airport
Some Southern and Thameslink services are likely to call additionally at Coulsdon South, Merstham, and Three Bridges
As a result of services diverting via Hertford North, the following stations currently have no service:
New Southgate
Oakleigh Park
New Barnet
Hadley Wood
Potters Bar
Brookmans Park
Welham Green
Hatfield
Welwyn Garden City
Welwyn North
Knebworth
Ticket acceptance on alternative routes
Your ticket will be accepted at no additional cost on the below:
Alternative Thameslink services between Brighton, Horsham, London and Stevenage
Alternative Great Northern services between London, Stevenage and Cambridge
Southern services between the south coast, Horsham and London
LNER services between London Kings Cross and Peterborough. (Please note, this train operator is also affected by this disruption)
Greater Anglia services between London Liverpool Street and Cambridge
London Overground services between London Liverpool Street and Enfield Town
London Underground between London Terminals
London Buses between central London and Potters Bar, and between central London and Crews Hill
Arriva 302 between St Albans, Hatfield, and Welwyn Garden City
In addition, your ticket will be accepted at no extra cost on the the below Uno Buses:
242 between Hatfield and Potters Bar
243 between Hatfield, Potters Bar, and High Barnet (for London Underground services)
341/641 between Hatfield, Hertford North, and Broxbourne (for Greater Anglia services)
602 between Hatfield, St Albans (for Thameslink services), and Watford Junction (for Southern services)
610 between Hatfield, Harpenden, and Luton (for Thameslink services)
625 between Hatfield and Stevenage (for alternative Thameslink and Great Northern services)
653 between Welwyn Garden City, Hatfield, and St Albans (for Thameslink services)
Planning your journey:
You can see live maps of the network here:
These maps will now show where your journey is likely to be delayed.
You can also use the Thameslink or Great Northern apps to get more information about your journey.
Hull Trains customer advice:
You can use your tickets at no extra cost on the following services:
LNER services between London Kings Cross and Doncaster (Please note, this train operator is also affected by this disruption)
LNER customer advice:
You can use your ticket on the following train companies at no extra cost:
Avanti West Coast between London Euston, Manchester and Glasgow Central / Edinburgh until 15:00
CrossCountry between Sheffield, Doncaster/Leeds, York and Newcastle/Edinburgh
East Midlands Railway between London St Pancras International, Leicester and Sheffield
Grand Central between Kings Cross and York - mutual acceptance. (Please note, this train operator is also affected by this disruption)
Great Northern and Thameslink between London Kings Cross, Stevenage and Peterborough - mutual acceptance. (Please note, this train operator is also affected by this disruption)
Greater Anglia between London Liverpool Street, Stevenage and Peterborough
Northern between Sheffield, Doncaster, Leeds and York
TransPennine Express between Manchester, Leeds and York/Newcastle
Please see the Alternative Route Map for more details.
Lumo customer advice:
You can use your tickets at no extra cost on the following services:
LNER services between London Kings Cross, Newcastle and Edinburgh. (Please note, this train operator is also affected by this disruption)
Check before you travel:
You can check your journey using the National Rail Enquiries real-time Journey Planner.
Compensation:
You may be entitled to compensation if you experience a delay in completing your journey today. Please keep your train ticket and make a note of your journey, as both will be required to support any claim.
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