Abellio Greater Anglia
Rail services to and from London are being delayed by up to 30 minutes due to trespassers on the track.
Trains are being held at various points between Hatfield Peverel and Shenfield while the incident is dealt with.
Some services to and from Braintree will now only go between the capital and Witham, while others will end at Stratford instead of continuing to Liverpool Street.
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