At train has broken down in Hatfield, blocking a line going southbound. Picture: Kevin Lines (Image: Archant)
Train services may be delayed by up to 15 minutes due to a broken down train at Hatfield.
The train is blocking one of the non stopping lines towards London.
Disruption to services between Welwyn Garden City and London are expected.
Great Northern is advising passengers to allow extra time for journeys.
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