Signalling problems at Bedford - due to the theft of cabling - is causing disruption on the rail network this morning.
A replacement bus is running on First Capital Connect between Luton and Bedford. Tickets are being accepted on First Capital Connecte services to and from King's Cross or Moorgate.
It is also causing delays of up to 20 minutes on East Midlands Trains between Luton and Wellingborough.
London Midland services are also affected between Bedford and Bletchley. Trains are not calling at Bedford and are terminating at Kempston Hardwick.