There is disruption on Southern Trains between Milton Keynes Central and South Croydon after a person was hit by a train at Bletchley.
Overhead line problems at Wolverton and congestion at Milton Keynes are causing further delays. It is not currently known when services will be back to normal.
Abellio, who run the Greater Anglia rail line, has been named Train Operator of the Year at the annual national Rail Business Awards.
Greater Anglia train operator Abellio says it's made real steps in customer service and punctuality in its first year in charge.
Greater Anglia have apologised for the delays that have disrupted services today