Passengers are being told to allow at least an extra hour. Services between Blackfriars and St Pancras are blocked until at least 3pm on Sunday, and no reopening is guaranteed.
Thameslink’s central London route has been shut on Sunday while engineers carry out urgent tunnel inspections and repairs between Blackfriars and St Pancras. The operator announced on X that both lines are expected to be blocked until at least 3pm. Trains are being diverted, delayed or cancelled, and services reach as far as Bedford, Cambridge, Brighton and Sevenoaks. National Rail said the tunnel at Farringdon was closed for “safety reasons”.
What Thameslink has said
Thameslink said its Sunday service normally starts at 9am through the core section, which runs between St Pancras and Blackfriars. “However, due to the inspections and repairs required, we are expecting both lines to be blocked until at least 3pm today,” it said. Engineers will probably be working for the next few hours.
At 10.40am, National Rail published expanded travel advice. It told passengers to allow at least 60 extra minutes for journeys, and at least 90 extra minutes for those heading to Gatwick or Luton airports. Farringdon and City Thameslink have no Thameslink service while the central tunnel is closed.
A possible structural problem
An updated disruption notice, published at about 10am, identifies Snow Hill Tunnel as the location of a possible structural defect. Network Rail engineers are investigating. It has not been confirmed that repairs are needed, as specialist teams must first assess the problem and decide whether repairs or other safety measures are required. The line can reopen only once engineers have established that the tunnel is safe, so the 3pm estimate is not a guaranteed reopening time.
Different versions of the notices place the suspected problem between Farringdon and St Pancras and between Farringdon and City Thameslink. The exact location has not been confirmed.
Which services are affected
With the core section closed, many trains are being diverted, delayed or cancelled.
- London Bridge services: Trains that normally run through London Bridge are diverted between Blackfriars and East Croydon, making journeys longer.
- Luton to Sutton: Trains terminate at Kentish Town, with a reduced service of two trains an hour.
- Brighton to Bedford: Trains terminate at Blackfriars, with a reduced service of two trains an hour.
- Horsham to Bedford: Trains terminate and restart at London Bridge.
- Bedford and St Pancras: The route is cut to two trains an hour.
- Sutton to Blackfriars: Service suspended.
- Rainham: Thameslink trains to and from Rainham, Kent, run only between Plumstead and Rainham. Tickets are accepted at no extra cost on Southeastern services between London and Plumstead.
- Cambridge and King’s Cross: Normal booked services continue.
Earlier advice said trains normally running between Cambridge and Brighton would terminate and restart at King’s Cross. The later notice lists the arrangements above.
National Rail said routes involving Bedford, Cambridge, Peterborough, St Albans, Luton, Brighton, Horsham, East Grinstead, Sevenoaks, Orpington and Rainham are among those affected.
No Thameslink trains are running through West Sutton, Sutton Common, St Helier, Morden South, South Merton, Wimbledon Chase, Wimbledon, Haydons Road, Tooting or Loughborough Junction.
Tickets and alternatives
Thameslink warned that commuters might need to switch to different train operators. Paper rail tickets are accepted on alternative services, along with London Underground journeys between the affected stations and Elizabeth line trains between Farringdon and Abbey Wood. Some bus journeys are also covered by Thameslink tickets.
National Rail has authorised passengers to use the following additional services at no extra cost:
- North of London: LNER between Peterborough and King’s Cross, Great Northern between Cambridge, Peterborough and King’s Cross, Greater Anglia between Cambridge and Liverpool Street, CrossCountry between Peterborough, Ely and Cambridge, and East Midlands Railway between Bedford and St Pancras.
- West and south of London: Avanti West Coast between Milton Keynes and Euston, London Northwestern Railway on specified Bedford, St Albans Abbey and Milton Keynes connections, Southern services, and South Western Railway between Portsmouth and Waterloo via Guildford.
- Across London: Underground services between London terminals, alternative London buses, the Elizabeth line between Abbey Wood and Farringdon, and London Trams between Wimbledon and Mitcham Junction.
Passengers with a cancelled train can use participating alternative operators within two hours before or after their original departure. Anyone who decides not to travel because of cancellations can request a full refund from the original ticket seller. Passengers who arrive at least 15 minutes late may be able to claim Delay Repay compensation through Thameslink’s online portal. Its policy distinguishes unexpected disruption from planned engineering work.
Other closures on Sunday
Transport for London’s published engineering schedule lists several separate planned closures on Sunday. They include the Elizabeth line between Paddington and Liverpool Street, and between Whitechapel and Abbey Wood, until 10.15am. The Suffragette line is closed entirely until 1.15pm, and the Hammersmith & City line between Plaistow and Barking is shut from 10am to 6pm. These are scheduled works and are not linked to the tunnel problem, but they may make alternative journeys harder.
Looking ahead
City Thameslink is due to close for more than seven months from 17 May 2027 until late December 2027, so that all 10 of its escalators can be replaced, according to Thameslink’s planned-work information. Network Rail says the escalators have reached the end of their operating lives. The closure is unrelated to Sunday’s emergency.
How the disruption unfolded
All times GMT on 15 November:
- 7.58am to 8.06am: National Rail records the incident and confirms the closure of the central tunnel.
- 10.07am: An updated notice identifies a possible structural problem and explains the safety inspections.
- 10.40am: National Rail expands its passenger advice, including the 60- and 90-minute allowances.
- About 3pm: Latest estimate for the end of major disruption. Reopening is not guaranteed.
