A Thameslink train. Picture: Danny Loo. (Image: Archant)
A trespasser on the Thameslink line caused disruption at St Albans City Station this morning.
The incident happened around Cricklewood, but journeys between Luton and London St Pancras International have been affected.
This is because trains have to run slower through the area and one line was blocked.
Network Rail and British Transport Police were attending the incident.
Commuters should expect delays until 10am.
For more information, visit www.nationalrail.co.uk/service_disruptions/today.aspx
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