A Great Northern train. Picture: Great Northern. (Image: Archant)
All train lines are now open on the Stevenage and Welwyn Garden City to London route following a broken rail on the track.
Network Rail engineers spotted the issue while working overnight between Finsbury Park and Moorgate, temporarily closing all lines while they fixed the problem.
Passengers travelling from Stevenage or Welwyn Garden City to Moorgate on the Great Northern line were facing disruption and cancellations while that work took place.
However, all lines are now open. There may still be delays, revisions, or cancellations until about 8am.
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