The Track Partnership is an alliance between Balfour Beatty Rail and London Underground that will see the contractor responsible for delivering track renewal work across London’s tube network.

The company was first awarded the contract in 2010. With the two-year extension, the contractor will continue work until March 2018.

Balfour Beatty will continue to provide design, labour, plant, and materials, as well as surveying, supervision and management of the renewal works.

Over the next two years London Underground said there would be a focus on enhancing efficiencies including measures which will see project managers given more accountability for driving down costs.

Balfour Beatty Group chief executive Leo Quinn said: “With world-class expertise in track, electrification and power supply systems, Balfour Beatty Rail is a significant player in the UK rail infrastructure market.

”We have utilised these market-leading skills and expertise working with London Underground over the last 13 years.

”This extension is a clear sign of London Underground’s confidence in the capability of Balfour Beatty within the Track Partnership.”