Services between Norwich and Great Yarmouth were cancelled after a signalling problem and there were delays on the London to Norwich line.
Problems caused by the cold weather were made worse after a car crashed into a level crossing near Stowmarket this morning.
The level crossing barriers were badly damaged following the accident on Station Road, Old Newton, at around 7.10am.
The barriers are expected to be repaired at 3pm.
Norwich, Great Yarmouth and Lowestoft services are now running on a normal timetable, while trains between Norwich and London are running every hour, rather than every 30 minutes.
Services between Norwich and Sheringham were also been disrupted because of signalling problems but are now running again.
•Trains cancelled included:
11.30 London Liverpool Street to Norwich
11.30 Norwich to London Liverpool Street
12.00 London Liverpool Street to Norwich
12.30pm Norwich to London Liverpool Street
1.00pm London Liverpool Street to Norwich
1.30pm Norwich to London Liverpool Street
2.00pm London Liverpool Street to Norwich
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