A safety inspection of the track between Watford Junction and St Albans Abbey means that the line is blocked.
As a result of this, trains are currently unable to run between these stations.
This is expected until 14:00.
Check before you travel:
You can check your journey using the National Rail Enquiries real-time Journey Planner
Twitter:
If you would like to follow this incident on Twitter, please use #StAlbansAbbey
Compensation:
You may be entitled to compensation if you experience a delay in completing your journey today. Please keep your train ticket and make a note of your journey, as both will be required to support any claim.