A fault with the signalling system between St Albans and Luton means that all lines are closed. Trains running between London St Pancras International and Luton may be cancelled or revised.

Disruption is expected until 05:30.

Customer advice

Thameslink

We have just been advised of a possible loss of signalling in the area between St Albans and Luton.

Network Rail are working to understand the situation, but at this time, trains will not travel in the area.

This will impact journeys beyond this immediate area, from Bedford, through Luton and London Blackfriars.

If the situation is prolonged, this will also impact the following:

• Services between Gillingham and to / from Luton
• Services between Sutton and St Albans

At this time, we have no alternatives to offer, so please speak to station teams for onward travel assistance.

Thameslink are working to update journey planners as best as they can, so they strongly urge you to check live journey planners before heading to your station.

The live departure boards can be found here.

You can view a live map of the network here.

You can also see the alternative route guide here.

Can you tell me more about the incident?

Initial reports suggest potential vandalism / theft of railway infrastructure, but train operators are seeking confirmation.

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.