London Underground Railways is adding the lines every year to cope with the increasing demand and the latest addition is to extend the Northern Line.

London Underground begun the extension of Northern Line to Battersea met another milestone as Tunnelling work started April 12th.  At present first of two boring machines began its 3.2km tunnelling journey to lengthen the line between Kennington to Battersea.



The two TBMW machines, called Helen and Amy, were lowered 20 metres below ground in Battersea back in February. Firstly ,Helen has started her work moving underneath south London to create the first new tunnel that will extend the Charing Cross branch of the Northern Line from Kennington to Battersea Power Station via Nine Elms.

According to tunnelling tradition, the machines given a name and, following a vote by local school children, the machines are being named Helen. Amy in honour of the first British astronaut, Helen Sharman, and British aviation pioneer Amy Johnson, who was the first female pilot to fly solo from Britain to Australia.



The Northern Line Extension will enable the regeneration of the Vauxhall, Nine Elms and Battersea areas, spurring economic growth by supporting around 25,000 new jobs and more than 20,000 new homes.

Construction is also boosting the UK economy, supporting around 1,000 jobs, including around 50 apprenticeships. As well as two new tunnels, two new stations are being created: one at the heart of the Battersea Power Station redevelopment and another at Nine Elms to the east, serving new developments such as the US Embassy and the redevelopment of New Covent Garden Market, as well as existing communities.

Amy will start her work in a month’s time. The extension is predicted to be completed in 2020 and is the first major tube line extension since the Jubilee Line in the late 1990s.
As the two machines slowly bore underneath the capital, around 20,000 precast concrete segments will be put in place to form rings to line and support the tunnels. Then, a conveyor system will take spoil from the worksite to barges on the River Thames. The spoil will then be transported to Goshems Farm in East Tilbury, Essex, where it will be used for agricultural purposes.

Around 300,000 tonnes of earth will be excavated by Helen and Amy, who are capable of moving up to 30 metres a day, being operated by around 50 workers.


Related Links:

Northern line extension

Work is in progress to extend the Northern line to Nine Elms and Battersea





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