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Northern line extension construction progress revealed

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Transport for London (TfL) has revealed the amount of work left to do on the Northern line extension.

With all tunnelling complete, TfL has given its latest update on the progress of track laying and station construction.

In December last year, New Civil Engineer revealed that the project would be delayed by nine months to a year and is now due to open in September 2021. TfL subsequently confirmed the delay in board papers released later that month.

At the end of the 2018/19 financial year, it is predicted that around £690M of public money will have been spent on the project meaning the final cost to the taxpayer will come in at around £1.1bn, 10% higher than the original £1bn cost estimate.

In its latest board papers, TfL confirmed that all track have now been installed throughout both the northbound and southbound tunnels between the twin-tunnelled extension from Kennington to the new terminus at Battersea Power Station, via a new station at Nine Elms.

The final piece of track – the diamond crossing in the Battersea crossover box – is due to be installed by June.

At Nine Elms station, work is progressing above and below ground. Contractors have finished laying track through the two platforms.

Above ground, the station buildingsare now at full height and work is ongoing to complete the roof. Work to create the internal walls and rooms in the station is still underway, as is the installation of the modular cable management system in the basement service corridors.


Meanwhile at Battersea station, blockwork construction continues on the internal walls to form the rooms in the new station.

Following the removal of the last tower crane, installation of the precast coffered panels, which form the ticket hall’s signature architectural ceiling, is also complete. The tower crane’s removal has also enabled TfL to complete the construction of the Prospect Way structure, which spans the station box and supports the roadway to the west of the main entrance. Utilities for the station will then be installed in the roadway.

At Kennington Park, the ground floor concrete slab and the columns for the head house are complete. While at Kennington Green, the head house structure and parapets are also complete. Construction of the ground floor internal and external walls of the head house continues.

The first of the extension’s 16 tunnel ventilation fans has also been successfully tested. The fan is 2.5m in diameter and will provide temperature and smoke control at Battersea station.

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