KiwiRail says some train tracks running into Christchurch are damaged and it could be several days before they are repaired.
The midland line from the West Coast to Canterbury is damaged between Rolleston - Darfield, and a section of track between Belfast - Rangiora including a rail bridge is under repair.
KiwiRail says trains bound for Christchurch from the north will stop at Rangiora and their freight taken into the city by road.
Trains are able to enter Christchurch from the south, but are running at a reduced speed as a precaution.
