There are delays to Thameslink services between St Albans and London due to a fault with the signalling system.
The signalling fault is affecting northbound trains between St Albans City and West Hampstead Thameslink stations.
Trains are running at a reduced speed, and are subject to delays and cancellations.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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