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
A man has been arrested after he was caught with a machete on board a train in Essex.
Luton's interim boss delighted with 4-0 win over Peterborough while Cambridge edge five goal thriller against Northampton.
Cold with increasing amounts of cloud overnight and an early frost. Low temperatures of -5 deg C (23 deg F).