Lines have now reopened following an earlier points failure between Watford Junction and London Euston.
As service recovers, trains may still be cancelled, delayed by up to 30 minutes or revised.
We anticipate disruption will continue until 19:00.
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.