Passengers travelling on key Essex rail routes are facing delays after a signalling fault has blocked some lines.
The issue at Maryland is affecting services running between Stratford and Ilford, with disruption expected to continue "until further notice", according to rail operators.
Greater Anglia said fewer lines are currently available, meaning its trains are having to share tracks with Elizabeth Line services.
As Elizabeth Line trains stop at intermediate stations, this is causing knock-on delays to Greater Anglia routes.
A Network Rail response team has been dispatched to investigate the fault and replace defective equipment.
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Routes affected include intercity services between London Liverpool Street and Norwich, as well as lines connecting London Liverpool Street with Ipswich, Clacton-on-Sea, Colchester Town and Braintree.
Passengers are being advised to allow extra time for their journeys and may need to take alternative services.
Greater Anglia said advance ticket holders can travel on earlier or later trains if their booked service is cancelled.
Customers delayed by 15 minutes or more may be eligible for compensation through the Delay Repay scheme.
Rail operators have apologised for the disruption and urged passengers to check live departure boards before travelling.
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