There are currently delays of up to an hour on East Midland Trains between Norwich and Peterborough.
There's also disruption on Greater Anglia between Norwich and Colchester and the service has been suspended between Colchester and Clacton-on-Sea, and between Colchester and Walton-on-the-Naze.
Work will go on overnight to repair the damage and if you are planning to travel tomorrow you are advised to check before setting out.
More top news
Norwich Cathedral's Peregrine Falcon has hatched its first chick this year - three more are expected within the next few hours
A man has been charged with murder in connection with the death of a man in Hitchin.
The Luton-based airline easyJet has banned the sale of nuts on its flights.