There is a speed restriction over defective track at Harlow Town, meaning that trains must run at reduced speed on all lines through this station.
As a result, trains may be cancelled, delayed by up to 15 minutes or revised.
This issue is expected to continue to affect services until the end of the day.
Customer advice:
Advance purchase tickets holders will be allowed to travel on earlier or later trains if their booked service is cancelled.
You can view a live map here to help you complete your journey.
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.