A fault with the signalling system between Harpenden and Luton Airport Parkway means trains have to run at reduced speed on some lines towards Luton. Trains running between St Albans and Luton may be delayed by up to 15 minutes or cancelled.
Disruption is expected until 14:00.
Customer advice
Thameslink
Thameslink trains may be delayed between Harpenden and Luton Airport Parkway. This is affecting services towards Luton and Bedford.
The signalling issue only affects one of the two northbound lines. If possible, trains will use the other line to bypass the issue, but this may not always be possible. Where trains can avoid the fault, they may depart from different platforms compared to those usually served between Harpenden and Leagrave (inclusive).
Your train may take up to 15 minutes of extra time to complete its journey, so please leave extra time.
Can you tell me more about the incident?
Thameslink have recently been informed of a track circuit fault in the affected area. Track circuits are part of the signalling system, maintained by Network Rail, and used to detect and monitor the passage of trains. Their staff are investigating.
Check before you travel:
You can check your journey using the National Rail Enquiries real-time Journey Planner
Twitter:
If you would like to follow this incident on Twitter, please use #Harpenden
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.