Due to a fault with the signalling system between Stevenage and Finsbury Park trains have to run at reduced speed on some lines. As a result, trains may be delayed by up to 15 minutes.

Disruption is expected until 10:00.

Customer Advice:

You can travel as normal but should allow up to 15 minutes extra to complete your journey as trains are being delayed in the run up to Alexandra Palace.

This will affect the following services:

• Cambridge to London Kings Cross and Brighton
• Peterborough to London Kings cross and Horsham
• Welwyn Garden City to Moorgate and Sevenoaks

Please check station screens and planners for the latest information for your train.

Planning your journey:

You can check train departures from your station here:

• Thameslink live departure boards
• Great Northern live departure boards

You can view live maps of our network here:

• Thameslink live route map
• Great Northern live route map

Can you tell me more about the incident?

Trains may be delayed due to a fault with a signal in this area. In this case, the signal is unable to show the normal coloured light indications to drivers, which means that your train will need to travel at reduced speed on this part of the network.

Railway signals are designed to warn drivers that they have to stop because the system can't yet confirm that the route ahead is clear. In most places, the signalling system will show a green light, or aspect, when the track is clear for a long distance ahead, and drivers will then be shown one or two yellow lights to warn them when they are approaching a red signal. This means that they can anticipate the amount of braking that's required to stop before they reach another train or any form of problem on the line.

Signalling runs on "fail safe" principles, so if the signals can't step through the usual colours, they will instead show a more restrictive colour - for example, yellow instead of green. This means drivers will be expecting to come to a stop, but in fact, the route ahead may still be clear. This leads to delays whilst trains proceed more slowly than usual.

The signalling system is maintained by Network Rail, and we're working closely with them to diagnose the fault and make sure it is fixed as quickly as possible. Until this is done, we'll be closely monitoring the train service and doing our best to keep to the timetable. We'd like to thank you for bearing with us.

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.