Transport for London today announced that the main programme of works to upgrade London’s busiest Tube line – the Northern line – will commence later this year.
When complete, the upgrade will deliver faster, more frequent and more reliable train services for customers, increasing capacity by 20% and cutting journey times by around 18%.
The upgrade works are due to be completed in 2014.
TfL said lessons ‘have been learned from the upgrade of the Jubilee line’ and a new approach is being taken on the Northern line that will mean ‘significantly fewer weekend closures than originally planned under the Public Private Partnership (PPP) contracts, with no early evening closures’.
Under the PPP, Tube Lines had proposed 65 weekend closures on the Northern line, many of which would have closed the whole line, or large parts of it.
Instead there will now be:
- Eight weekends of full line closures for the installation and testing of the new signalling system, spread out so as to cause minimum disruption, with five closures in 2013 and three in 2014.
- Eight additional weekends where shorter sections of the line will be closed, many of which will affect only the High Barnet branch, the most lightly-used section of the line.
- Six closures of parts of the line during the quieter Easter and Christmas holiday periods which will be closed for 4 or 5 days respectively.
Tube Lines had also planned 18 months of weekday early evening closures affecting the whole line, with last trains due to have left the centre of London by 22:00.
From October, the northern branches of the line will in turn start up slightly late on Sundays to allow for extensive work during Saturday night’s engineering hours to be completed.
This will give greater flexibility to install and test the signalling and will impact on considerably fewer people than either early evening closures of a series of weekend closures.
Services on the High Barnet branch will start from 8.30am on Sundays through to November 2012, followed by the Edgware branch through to November 2013.
Overall, this represents a reduction of over 60% in the number of passenger journeys that will be disrupted by the work compared with the number that would have been disrupted under the original PPP plan.
Isabel Dedring, the Mayor of London’s Deputy Mayor for Transport, said:
“Delivering more reliable journeys for Londoners wherever they are on the transport network is a top priority for the Mayor.
“The team at the Underground have completely overhauled the Northern Line upgrade programme to ensure that passengers do not have to go through a repeat of the disruption they suffered with the Jubilee Line upgrade.”
In order to achieve this reduced closure programme London Underground will be intensifying the amount of work done during night-time engineering hours, using the hours where the network is closed each night in full to carry out upgrade works, as well as the usual maintenance work.
In addition, much more system testing will be done ‘off site’ using improved simulators, and on an extended and enhanced test track at Highgate, to reduce the time needed for closures and to drive out any problems in the system before it goes live for passengers.
Improvements made for the Jubilee line system (which uses the same hardware and software) will automatically be carried across to the Northern line.
Staff who will operate the system on a day to day basis, including train operators, will also have a greater involvement in putting the new system through its paces in simulators to iron out issues off site.
These new approaches will together help to ensure that the new system is reliable once it is used in passenger service.
The upgrade will proceed in phases to minimise risk, starting with off-site software development and testing, followed by the new system being applied in the High Barnet area before being rolled out across the rest of the line.
Following Transport for London’s acquisition of Tube Lines last summer the Jubilee line upgrade is now on-track for completion at the end of next month.
London Underground Managing Director, Mike Brown, said: “We know how disruptive weekend engineering works can be and we’re determined to learn lessons from the Jubilee line upgrade, the last of the PPP upgrades.”