Trains travelling to London from Essex are affected due to safety checks between Chelmsford and Witham.
These checks are causing potential delays to train coming from Essex heading towards London.
Services are currently running at reduced speeds and disruption is expected until further notice.
Routes affected
• Liverpool Street - Braintree
• Liverpool Street - Clacton-on-Sea
• Liverpool Street - Colchester Town
• Liverpool Street - Norwich/ Ipswich
A Greater Anglia update on X said: "These restrictions may lead to significant delays or changes to services.
"Engineers are on site working to assess and fix the issue. Please allow extra time for your journey.
"Trains can still run in both directions.
"However, your journey may take longer than usual due to speed restrictions.
"Greater Anglia and Network Rail are sorry if your journey has been affected by this disruption.
"Specific service alterations here: https://journeycheck.com/greateranglia/."
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