Greater Anglia has cancelled all trains to Peterborough, while Bury St Edmunds passengers will see delays to Ipswich and Cambridge
Greater Anglia has suspended all services from Bury St Edmunds to Peterborough and cancelled many services to Ipswich and Cambridge today (Monday, December 9).
Trains through Thetford have also been affected due to the signalling problems - which are set to cause disruption all day.
It also means the usual hourly service from Ipswich to Cambridge - which calls at Bury - has been reduced.
"The Ipswich to Peterborough services will be suspended until further notice due to a shortage of trains as a result of the signalling fault," the company said.
"Customers are advised to travel to Norwich and travel on a train to Ely where their tickets will be accepted on Cross Country and East Midlands Railways services to Peterborough.
"Manea and Whittlesea will not be served as a result of these services being suspended. Customers at these stations are advised to use the help points so that we can assist with arranging alternative transport."
A statement added: "Due to major signalling problems across the rural routes affecting train services between Ipswich and Felixstowe/Peterborough/Cambridge are being severely disrupted.
"This has also resulted in services being suspended between Marks Tey and Sudbury, where buses will operate in place of trains.
"Passengers are advised to check our website before they travel and allow extra time for their journey."
Customers delayed by 15 minutes or more can DelayRepay.