Londoners are set for a weekend of major Tube disruption with four lines hit by closures in order to carry out upgrade work.
The Circle line will be shut entirely, while the District, Hammersmith & City and Metropolitan lines will all be closed partly.
Transport for London (TfL) is planning to test a “vital” new signalling system over the two days, designed to boost the network’s capacity by 33 per cent when the project is complete in 2023.
The closures will allow engineers to run test trains on the newly-installed signalling system around the complex Aldgate junction, where all four lines intersect.
Earl’s Court and Baker Street are the other key junctions involved in the upgrade, which will allow trains to run closer together and therefore increase frequency.
Stuart Harvey, TfL’s Director of Major Projects, said: “The complex modernisation of these four Tube lines will make a huge impact on the whole Tube network.
“It will significantly boost capacity and reliability, making journeys better for hundreds of thousands of customers every day.”
The Circle, District, Hammersmith & City and Metropolitan lines are among the oldest sections of the underground network, with parts dating back to 1863.
They carry a combined 1 million passengers each day and make up 40 per cent of the entire network.
Separate engineering work over the weekend means the Bakerloo line will also be closed north of Queens Road.
The rest of the network is expected to be busier as a result of the works, especially interchanges such as Oxford Circus and Bank.
TfL said rail replacement buses will run from Tower Hill to Barking via Canning Town in east London, and extra buses will operate in west London.
There will be no TfL Rail service between Liverpool Street and Shenfield all weekend due to Network Rail work.
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