Lines have now reopened following an earlier problem under investigation between Stratford and Romford.
As service recovers, Elizabeth line services may still be cancelled or delayed by up to 15 minutes.
We anticipate disruption will continue 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.