An “operational incident” is causing disruption to trains between St Albans City and Luton.
Services may be delayed by up to 10 minutes after a 7.37am service had to stop at City station, blocking platform two.
The disruption is expected to last until 10am.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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