A multiple signalling faults between Ipswich and Kelvedon means trains are running at a reduced speed.
Abellio Greater Anglia has reported that train services running through these stations may be delayed by up to 25 minutes or revised at short notice.
“An estimate for the resumption of normal services will be provided as soon as the problem has been fully assessed,” said a spokesman for the train operator.
Network Rail technicians are attending to faults reported at Witham, Kelvedon and a location between Manningtree and Ipswich.
The fault follows earlier disruption when a train was seen billowing smoke in Shenfield and required emergency attention. And earlier today, over-running engineering works spelled more delays and cancellations for early morning commuters.
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