There are delays of up to 20 minutes on CrossCountry and Stansted Express services in Hertfordshire, Essex and Cambridgeshire due to a fire alert at Stansted Airport.
There are 30 minute delays on CrossCountry services between Stansted Airport and Peterborough due to electrical supply problems at Cambridge. This is also causing problems on First Capital Connect services between King's Lynn and Letchworth Garden City.
There are also 30 minute delays on First Capital Connect services between Stevenage, Welwyn Garden City and King's Cross due to a signalling problem at King's Cross. This is also affecting East Coast trains.
There are also 40 minute delays on Greater Anglia Trains travelling between Chelmsford and London and services from Chelmsford may be cancelled.
Delays of up to one hour on CrossCountry between Stansted Airport and Cambridge, and between Stansted Airport and Peterborough due to overhead line problems between Elsenham and Stansted Mountfitchet.
Disruption on CrossCountry between Birmingham New Street and Stansted Airport due to signalling problems between Leicester and Loughborough.