A fault with the signalling system at Queens Park means that some lines are blocked.
London Overground services between London Euston and Watford Junction may be cancelled, or delayed. This is expected until 15:00.
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.