Trains passing through Romford and Ilford are subject to delays and cancellations due to an earlier fault.
The Metro service, which runs between Liverpool Street and Shenfield, is subject to delays of five minutes.
The 8:15 from Gidea Park to London Liverpool Street has been cancelled due to a fault on the train.
Earlier trains have been cancelled or failed to call at all stops and congestion has been reported on social media sites.
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