Potters Bar trains affected by broken-down train between Knebworth and Welwyn North.
- Credit: Archant
Trains from Stevenage to Finsbury Park via Potters Bar have been disrupted by a broken-down train.
Engineers are currently working on the train, which has been stranded between Knebworth and Welwyn North.
National Rail say services may be disrupted or subject to alteration.
This disruption is expected to last until 9am.