Greater Anglia say that lines have re-opened after rail passengers were told not travel following an emergency incident.
Emergency services were dealing with an incident close to the railway between Chadewell Heath and Romford in Essex meaning that some lines were blocked.
Services between Ipswich and London Liverpool street were cancelled, delayed or revised and will remain so until 4pm today.
A number of services into the capital from Suffolk and Essex were cancelled.
As a result Greater Anglia were warning travellers to stay away as they run a reduced service.
Greater Anglia tickets are being accepted on the London Underground , c2c sevices and First Essex bus routes between Colchester and Colchester Town.
In a statement on their website the rail operator said: "Greater Anglia and Network Rail are sorry if your journey has been affected by this disruption."
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