Disruption is expected to continue on the Norwich to London Liverpool Street line until midnight due to flooding as passengers are being urged not to travel 'unless absolutely necessary'.
Trains on the line are being cancelled or delayed after torrential rain overnight caused the tracks to flood at Manor Park.
Passengers are being advised to check timetables before they travel after the track flooded at Manor Park, and those bound for London should divert through Cambridge.
Those bound for Norwich from London Liverpool Street are being advised to travel on London Underground services to King's Cross before travelling onto Norwich via Cambridge.
The 4.30pm from Norwich to London Liverpool Street will be the first train to run to London since the disruption started early Thursday morning.
The following services are also running:
•One train on the hour from Norwich to Shenfield to call at scheduled stations.
•One train an hour between Shenfield and Norwich calling at Chelmsford, Whitaham, Colchester, Manningtree, Ipswich, Stowmarket and Diss.
•One train on the half hour between Norwich and Colchester to call at scheduled stations.
•One train an hour between Colchester and Norwich calling at Manningtree, Ipswich, Stowmarket and Diss.
Abellio Greater Anglia tweeted that they are receiving nearly 27 messages a minute from passengers.
A spokesman for the franchise said: 'We would like to apologise to passengers for the disruption affecting many services between Norfolk, Suffolk, Essex and London today.
'This is due to extensive flooding, caused by heavy rain, which has necessitated the closure of the lines between Ilford and Stratford. Network Rail engineers are working to clear the lines as quickly as possible.
'Passengers are encouraged to use alternative routes or delay their journeys where practical. The process of trying to clear the tracks and provide alternative road transport has also been severely hampered by localised flooding on the roads.
'We will continue to work with Network Rail to restore the normal service as soon as possible.'
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