West Coast Mainline trains disrupted by Leighton Buzzard landslip
A landslip on the West Coast mainline in Bedfordshire is causing train delays between London, the Midlands, North West of England and Scotland.
Network Rail engineers are at Linslade, near Leighton Buzzard, working to repair damage to an earth viaduct.
Services would not return to normal until Friday and emergency timetables were in use, a spokesman said.
Network Rail have not yet said what caused the landslip but London-bound sections of track are shut to trains.
Amended train timetables would remain in place "until further notice", operator London Midland said.
Virgin Trains said its services running through Milton Keynes Central and Watford Junction may be delayed by up to 15 minutes.