Network Rail recorded 1,160 incidents in the 12 months to the end of July on the route between Norwich and London Liverpool Street, with nearly 3,500 recorded in the past three years.
In January 2013 alone, nearly 300 incidents were recorded, which equates to an average of 12 per day.
The information, released under Freedom of Information laws, did not include signal faults, train issues and overhead cable defects.