Trains between London Liverpool Street and Norwich are being delayed due to a signal fault.
The fault, between Diss and Stowmarket is causing trains to run at a reduced speed on all lines, affecting services running through Ipswich, Colchester and Chelmsford.
Delays of around 10 minutes are expected on services running to and from London and Norwich until 10am.
Network Rail engineers have been informed of the problem and are going to the fault which is affecting the level crossing at Wassicks.
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