Great Northern rail users have been warned to expect delays until the end of service today if they are travelling between Stevenage and London.

A person has been hit by train between Welwyn Garden City and Finsbury Park, blocking all lines between Stevenage and London.

Passengers on Thameslink and Great Northern will benefit from 200 extra services this December, Govia Thameslink Railway has announced.

Train services between Welwyn Garden City and London’s Finsbury Park may be cancelled or delayed following an “operating incident”.

Damage to overhead wires between Royston and Cambridge North means there is disruption on the Great Northern line.

Govia Thameslink has published details of the new interim timetable, which they say “marks a significant stage in the recovery plan” following chaos on their services.

“Dangerous” – that was the word used in a conversation between two members of Great Northern rail staff amid overcrowding at Hitchin this morning, commuters have said.

A reduced Great Northern service is operating today – the first day of the new timetable – with trains being cancelled or revised.

There are train delays on the Great Northern line tonight due to a signalling fault, with disruption to services between Stevenage and Potters Bar expected to continue until 8pm.

All train lines are blocked between London King’s Cross and Alexandra Palace due to a damaged overhead electric wire causing major disruption to all services in and out of London.