Due to a track circuit failure in the London Blackfriars area means that Thameslink trains across its network are being affected.

A track circuit detects whether a train is in a section, so when it fails, it could say a train is in a section when it isn’t.

Ticket acceptance is in place with East Midlands Railway, CrossCountry, Great Northern, Greater Anglia, London Underground, London Buses, Southeastern, Southern, Elizabeth Line and Gatwick Express.

Major disruption is expected until the end of the day.

Thameslink has announced the following changes to the timetable:

• There will be a reduced service between Bedford and Gatwick Airport / Three Bridges
• Trains that run between East Croydon and East Grinstead are suspended
• Trains that run between Luton and Orpington are suspended
• Trains that usually run between Cambridge and Brighton are suspended
• Trains between Welwyn Garden City and Sevenoaks will operate only between London Blackfriars and Sevenoaks
• Trains between Luton and Rainham will operate only between Dartford and Rainham
• Trains that usually run between Peterborough and Horsham, will call additionally at Salfords and Earlswood, in both directions
• Trains that usually run between Cambridge and London Kings Cross will call additionally at Ashwell & Morden in both directions