London Underground has issued an invitation to tender for a re-signalling programme on its sub-surface lines that was originally placed by collapsed contractor Metronet.
The contract, which is the single biggest piece of work on the Tube since the Second World War, covers the Circle, District, Hammersmith & City and Metropolitan lines.
The new signalling, together with 191 new walk-through trains, will increase the capacity of the lines by nearly 50 per cent.
LU decided to re-tender the contract last year following the collapse of Metronet in 2007 because it said the original contract placed by Metronet did not provide the best technical solution or the best value for money.
London Underground managing director Richard Parry said: “This new sub-surface lines signalling contract will, when complete, deliver huge increases in capacity and reliability, to provide our customers with the service they need.
“The original contract that we inherited from Metronet was over-priced and incompatible with other signalling systems on the Tube network.”
The sub surface lines cover over 300km of track and serves around 40 per cent of the Tube network