Great Northern trains running through Welwyn Garden City, Stevenage and Royston may be delayed due to damage to the overhead wires at Knebworth.
The electric fault was identified at around 8.45am today, and services through Knebworth were either cancelled or delayed.
By around 9.05am power was restored and services returned to normal, however some trains may be residually delayed while normal service resumes.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here