Delays of up to 60 minutes possible on London Midland between Milton Keynes Central and Tamworth due to overhead line problems between Rugby and Nuneaton.
Some services may be diverted via Coventry. Delays are expected until around 12:00.
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