Morning commuters face disruption after rail services along the Norwich to London line were cancelled.
Greater Anglia said a fault with the signalling system was affecting services on the line.
The services cancelled include the 6.25am service from London Liverpool Street to Norwich, the 6.39am service from Ipswich to Norwich and the 8am, 1pm and 2.30pm services from Norwich to Liverpool Street.
The 9am service from Norwich to Liverpool Street was also cancelled but subsequently reinstated.
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