Overhead line problems at Watford Junction have caused disruption on London Midland Services from Hertfordshire to London and Southern Trains between Milton Keynes and the Capital.
Disruption is expected to last until around 9am.
There are delays of up to 20 minutes on trains through Northampton due to a broken down train which has closed one of the platforms at the station.
A replacement bus service is running on the London Midland service between St Albans Abbey and Watford Junction due to broken down train.
There is no current estimate for when a normal service will resume.
Severe delays with replacement buses running on London Midland and Virgin services between Milton Keynes and Northampton, and on to Wellingborough for connections to London. It is being caused by overhead line problems.
Disruption on London Midland trains between Coventry and London Euston due to earlier over-running engineering works between Rugby and Northampton. Tickets being accepted on Virgin Trains services.
Replacement bus service running on London Midland trains between Bedford and Bletchley due to broken down train at Lidlington.
There is disruption on London Midland trains between Milton Keynes and Crewe while emergency services deal with an incident at Stoke-on-Trent. There is currently no estimate for when services will be back to normal.
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.
Replacement road transport on London Midland between Bletchley and Bedford due to emergency engineering works. Tickets being accepted on First Capital Connect services.Taxis and minbuses are currently replacing trains, extending journey times by up to 20 minutes.
Delays of up to 30 minutes on London Midland between Milton Keynes Central and London Euston due to signalling problem at Bletchley.