Overview
- Thameslink, which reported the incident early Wednesday, suspended all trains between St Albans City and Bedford.
- The operator said disruption could last until about 5am with cancellations, hour-long delays, or revised routes.
- Network Rail and emergency services are on site to secure the line and manage the response.
- Passengers were told to stay on trains between stations, wait for updates, and avoid walking on the tracks.
- Tickets are being accepted on London Night Buses between Elstree & Borehamwood, Central London, Croydon and Purley, on London Northwestern Railway between Milton Keynes Central and London Euston, and on early Great Northern routes to London Kings Cross.