Following earlier overrunning engineering works between Finsbury Park and Stevenage, all lines have now reopened.
Services are now on the move, but trains may still be delayed or revised.
This issue is expected to continue to impact services until 10:00.
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.