A replacement bus service is running on First Capital Connect between Hitchin and Royston due to emergency engineering works.
Journey times may be extended by up to 30 minutes. There is no estimate for a normal service.
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.
There is disruption on First Capital Connect trains between Bedford and Brighton due to signalling problems. Tickets are being accepted by other operators.
There is also a replacement bus service for London Midland trains between Bedford and Bletchley because of a staff shortage. Journey times could be up to 30 minutes longer than usual.
Delays remain on the trains this morning due to overhead line problems in Hertfordshire.
All lines are re-opened, but there are still 20-minute delays on First Capital Connect and East Coast trains heading into London King's Cross, due to speed restrictions.
Signalling problems between Hitchin and Stevenage are causing delays of about 30 minutes on East Coast trains between Peterborough and Kings Cross
That is also affecting First Capital Connect services between Cambridge and Kings Cross, and Peterborough and Kings Cross with delays of 30 minutes.
There are delays of up to two hours on First Capital Connect trains between Peterborough and Kings Cross due to a broken down train at Huntingdon. There is no current estimate of when services will be back to normal.
Delays of up to one hour on First Capital Connect between Bedford and Brighton due to broken down train at Balcombe. Tickets being accepted on Southern services. First Capital Connect currently do not have an estimate as to when a normal service will resume.
Delays of up to 30 minutes on First Capital Connect between Luton and St Pancras due to signalling problem at Kentish Town. London Underground are accepting tickets for reasonable routes.
A man who died at a level crossing in Norfolk last week has been named as 64-year-old Rodney Wheeler.Read the full story ›
People living near the level crossing in Norfolk where a car and train collided yesterday say it's only a matter of time before it happens again.
The driver of the Kia car, named locally as Rod Wheeler, was killed as his vehicle crossed the tracks between Littleport and Downham Market on the line from King's Lynn to Kings Cross. Russell Hookey reports