CONTRACTOR TUBE Lines is to shut a key section of the London Underground's Northern Line for four days over Easter to carry out £1.6M of track and signalling renewals.
The 6km section between Golders Green and Edgware is old and suffers frequent service interruptions.
Tube Lines is to replace 238m of track and five sets of points in a 100 hour possession.
'The section is not as effective as it could be. The age of the junction infrastructure means it is prone to failure and needs replacing, ' said Tube Lines permanent way projects delivery manager Amjad Bangash.
The project is part of plans to upgrade the Northern Line in seven key sections during a series of weekend blockades (NCE 9 March).
Tube Lines will take possession of the track as soon as services close next Thursday.
It will take two to three hours for engineers to take possession of the track and bring in the engineering trains carrying equipment.
Over the next 25 hours the low voltage signal cables will be removed, before the existing track and sleepers are ripped out.
New geotextile and ballast will then be placed before the next 60 hours are spent placing nine pre-assembled track units.
These are fabricated so that the sleepers can then be inserted underneath the rails, 'keeping the weight of the track units down', said Bangash.
Top ballast will then be placed and the system tamped before new M&E equipment installed and the system tested.