A fault with the signalling system has reoccurred between London Euston and Harrow & Wealdstone, blocking all lines.
As a result, London Overground service is suspended between these stations.
This is expected until 15:00.
Customer advice:
Two trains an hour will shuttle between Harrow & Wealdstone and Watford Junction.
You can use your ticket on local buses, London Buses and London Underground via any reasonable route.
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.