Major disruption for rail passengers on the eastern mainline will continue until Thursday evening, Greater Anglia has warned.
Damage to overhead lines at Colchester means all lines are blocked and trains have been unable to run between Ipswich and Colchester since this morning.
"There is overhead wire damage Ipswich side of Colchester Station, which will need to be repaired. The wires carry the electric current to the trains. Whilst this is happening we are unable to run any trains through Colchester, as the electric will need to be turned off for the repairs."
Network Rail engineers are on site working to repair the electric wires but Greater Anglia warned its customers that would take hours.
Its latest update on Twitter said disruption would continue until at least 6pm Thursday, February 13.
Customers wanting to get from Norwich to London have been advised to travel via Cambridge - with their tickets accepted on East Midlands Trains' Norwich to Ely services.
Some replacements buses are available between Ipswich and Colchester.
And, for passengers trying to get from Colchester Town to Colchester, their ticket will be accepted on local buses.