Great Northern services between Royston and Hitchin are prone to delays and cancellations this morning.
Engineering work between the two stations has been completed, however the service is still recovering and trains may continue to be cancelled or revised.
Tickets are being accepted on other services to help passengers with their journeys.
The disruption is expected to last until 9am.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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