Due to a fault with barriers at a level crossing at Kelvedon, trains have to run at a reduced speed on all lines.
Train services running through this station may be cancelled or delayed by up to half an hour, Abellio Greater Anglia has warned.
Disruption is expected until 7pm.
For alternative routes and more information, visit the Abellio Greater Anglia website.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here