FIRST Capital Connect services between St Albans and St Pancras will be delayed for up to 15 minutes for most of the morning.
There are currently overhead line problems between Cricklewood and Radlett and FCC has advised a normal service is not expected to resume until noon.
The problems are also affecting East Midland Trains services.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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