National Rail says repairs have been done to make the viaduct safe.

There will be large scale engineering work affecting services on the Thameslink network.

The Southern train travelling from Victoria "collided with the buffers at low speed".

Services on Southeastern, Govia Thameslink Railway and South Western Railway will all have changes.

GTR says passengers will be able to use the SignLive app at all 236 of its stations.

The closure will begin at 01:00 GMT on Saturday and is scheduled to be completed by 02:00 on Monday.

Network Rail says the delays caused by the weather could continue until at least midday.

Flood alerts are issued and rail services are disrupted by fallen trees as Storm Bert hits.