Travellers are being warned of delays of up to 20 minutes on the trains due to a signal problem at Kelvedon.
It is mainly London bound trains that are travelling between Colchester and Chelmsford that are being affected.
The1448 Liverpool St to Braintree service was terminated at Witham and the 1600 Braintree to Liverpool Street instead starts at Witham 1617 due to earlier signalling problems.
Replacement buses are being used.
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