Train passengers faced disruption this morning due to over-running engineering work.
Greater Anglia said some lines had blocked due to engineering work at Ilford work not being completed when scheduled.
Network Rail staff have dealt with the issue, but it is affecting services to and from London Liverpool Street.
Some services have been cancelled and others have been delayed.
Among services delayed were the 5am and 6am Norwich to London Liverpool Street service, along with the 6.25am London Liverpool Street to Norwich service.
Separate issues have also affected other trains in the region.
The 6.52am service from Norwich to Great Yarmouth and the 7.30am Great Yarmouth service to Norwich have been cancelled due to a fault.
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