Passengers travelling on the main Norwich to London line today are being warned to expect delays after a points failure.
The problem between Manor Park and Ilford means train have to run at reduced speed on some lines.
Greater Anglia says trains may be cancelled, delayed by up to 20 minutes or revised. Disruption is expected until the end of the day.
Services from Norwich, Clacton and Southend are affected.
Passengers can find out the latest here.