Passengers on the Suffragette line face disruption for the rest of the day after an issue between Barking Riverside and Barking blocked all lines between the two stations.
The issue was first reported at about 4.45am this morning.
London Overground services between Barking Riverside and Gospel Oak will now only run between Barking and Gospel Oak, and some services have been cancelled entirely.
Barking Riverside station is not being served, and disruption is expected to continue until the end of the day.
The cause of the problem has not yet been confirmed.
National Rail said passengers can use their tickets at no extra cost on London Buses via any reasonable route, and should check their journey for today using the National Rail real-time Journey Planner.
The statement added: “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.”
The Suffragette line runs from Gospel Oak in north London to Barking in the east, and Barking Riverside is its newest station, serving the large riverside housing development in the area.
It is the latest disruption on a weekend of travel problems across the capital, with the Northern line partly closed until 1.30am on Sunday and no Southern trains running between London Bridge and East Croydon on Sunday.
