Passengers are facing delays between London Liverpool Street and Ipswich due to a smouldering railway sleeper.
Lines are blocked between Stratford and Bethnal Green due to safety checks being made.
The affected routes include London Liverpool Street to Ipswich, Norwich, Clacton, Colchester Town, Braintree, and Southend Victoria.
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Network Rail engineers are en route to extinguish the sleeper and train services are delayed while they divert around the affected track.
A railway sleeper is what the track sits on, some of which are made from wood.
A spokesman for Greater Anglia said: "Advance purchase ticket holders will be allowed to travel on earlier or later trains if their booked service is cancelled.
"Greater Anglia and Network Rail are sorry if your journey has been affected by this disruption."
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