Delays have been caused by a signal fault
Rail services are running at reduced speeds on some lines due to a signalling system fault between Chelmsford and Ingatestone.
Train services running through the stations may be subject to disruption by up to 10 minutes, including routes to and from London Livepool Street through Colchester, Ipswich and Norwich.
The first services affected were from 8.30am.
Network Rail engineers are en route to the site of the fault.
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