Track work is taking place between Seven Kings and Gidea Park, closing two of the four lines overnight from Monday evening until Friday morning.
After 21:25 each night, trains running through the area may be subject to extended journey times by up to 15 minutes.
Additionally, the 21:10 Southend Victoria to London Liverpool Street and the 21:35 London Liverpool Street to Southend Victoria services will not run.
Check before you travel:
These changes are not currently shown in the National Rail Enquiries Journey Planner, please check back nearer to the time of travel.