A fault with the electric third rail between Bushey and Watford Junction means that all lines are blocked. London Overground services between London Euston and Watford Junction will be cancelled or revised.
Disruption is expected until 20:00.
Customer advice
You may use your ticket on local buses 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.