A points failure at Welwyn Garden City means some lines are blocked. As a result, Great Northern and Thameslink services running through this station may be cancelled, delayed by up to 30 minutes or revised.
Disruption is expected until 09:00.
Customer advice:
Great Northern trains from London Kings Cross cannot go further than Welwyn Garden City due to a points failure. Services that would usually run from London Kings Cross to Cambridge will be terminated at Welwyn Garden City.
We've recently been told about this incident disrupting Great Northern services, and we're working to get more information for you.
Your journey is likely to be delayed, but we don't have an exact estimate for this at the moment.
You'll be able to see any further updates on this page, so please continue to check back here.
If you need to use another route, we'll let you know shortly.
Planning your journey
You can see a live map of the network here. This will now show where your journey is likely to be delayed.
Can you tell me more about the incident?
A points failure has been reported, and this is preventing trains from travelling from Welwyn Garden City to Stevenage.
Points are moveable sections of track which can send trains onto different routes at junctions. These are part of the signalling system, generally managed by Network Rail.
Points can stop moving correctly for a number of reasons. For example, there may be an obstruction in the moving parts, or the electronic control systems may have developed a fault.
There are various backup systems which allow signallers to try to "set" the points, and in some cases, the points may be available for trains in one of the directions they serve, but not another.
Network Rail will send their specialist signalling and telecoms teams to site, and they will set up a safe method of working on the track. To allow staff to access the railway, sometimes we have to stop trains completely, which can lead to trains on other routes also being held at stations or signals.
As soon as it's safe to go on the line, the staff will diagnose the fault and find any quick solutions to resolve it.
Whilst this is being done, we will be monitoring progress closely. At times, replacement parts may be needed, or specialist advice from suppliers, which is why some points failures take longer to resolve than others.
Check before you travel:
You can check your journey using the National Rail Enquiries real-time Journey Planner.âââââââ
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.