Infrastructure operator Network Rail has told NCE the five lines affected by Monday’s mudslide south of Croydon will need replacing.
Between 200-300m along five lines of track affected by the burst water main will need to be replaced because foundations underneath are irreparable.
The schedule for the weekend possessions has not been decided yet.
All five lines have been reopened following the mudslide and a normal services has resumed. The mudslide was caused by a ruptured water main adjacent to the track which over 2,400t of debris onto the railway.