Metronet Rail was the brand of a partnership within the London Underground group. The group was responsible for the maintenance and upgrade of the infrastructure on nine London Underground lines. They would do the maintenance of tracks, trains, signals, civil work and stations. From 18 July 2007 to 26 May 2008, the company was in administration and had to be bailed out by the government. On 27 May 2008, the company was transferred back into public ownership under the authority of Transport for London.