Transport for London has awarded Thales the contract to modernise signalling and train control sysyems on London Underground’s Circle, District, Metropolitan and Hammersmith & City lines.
The improvements will boost capacity by a third across these four lines by allowing an increase in the number of trains per hour.
Work is due to begin later this year and complete in stages to 2023.
The Victoria, Northern and Jubilee lines have already undergone improvement works.
London Underground managing director Nick Brown said: “Having successfully modernised three of the most heavily used lines on our network, we are ready to begin work to bring the next four lines into the modern era.
“We have a very clear delivery plan and timetable for the work and, as we have done with the modernisation of the Northern Line, we will keep London moving and growing as we do it.”
Thales chief executive Patrice Caine said: “If the Jubilee and Northern lines’ success is any indicator, future travellers on the Circle, District, Metropolitan and Hammersmith & City lines will experience faster journeys, reduced over-crowding and increased service reliability.”
Businesses in the capital welcomed the contract award.
“The business community sees these major signalling upgrades as a vital boost. The capital’s success means that its population is increasing by 100,000 a year, and we need the transport capacity to cope. These improvements will increase capacity on Tube lines by up 65%, helping workers and consumers alike get around the capital, and boosting economic growth,” said London First head of transport policy Richard Dilks.