Metropolitan Line services have resumed following a 23-day block closure.
Over 23 days the Track Partnership team, a strategic alliance between London Underground and Balfour Beatty, worked around the clock to replace 6.1km of new ballasted track.
This included 18,000 tonnes of new ballast, 10,000 new fast clip sleepers, 5,000 conductor rail pots, the installation two sets of points at Harrow-on-the-Hill, waterproofing three bridges and completing 4km of track drainage work.
Stuart Burnett, London Underground’s head of strategy and planning, said: "I would like to take this opportunity to thank customers for their patience while these works took place. The track replacement work on the Uxbridge branch is a crucial part of the Metropolitan line upgrade.
"Carrying out a block closure of this section of the network enabled us to complete the work in just over three weeks as opposed to fourteen weekend closure, which meant that we didn’t lose time to set-up and hand-back of works. We were able complete the works on time and on budget and even managed to run a preview service the Metropolitan line on Friday afternoon before the final weekend of this block closure."
The work was part of London Underground’s £10 billion improvement programme.