Engineering work is taking place between Stratford and Romford, closing some lines.
Journey times between Stratford and Romford will be extended by up to 15 minutes.
Trains will depart London Liverpool Street up to 15 minutes earlier to maintain timings after Romford.
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.