A major change has been in the actual owner of the infrastructure. The aftermath of the Hatfield rail crash in 2000 led to severe financial difficulties for Railtrack and just under a year later the company was put into a special kind of insolvency by the High Court in England at the direction of the government. The circumstances of that were very controversial, and eventually led to the largest class legal action in English legal history. The administration led to instability in its share price, and on 2 October 2002 a new organisation, Network Rail, bought Railtrack PLC from its parent Railtrack Group PLC. Network Rail has no shareholders and is a company limited by guarantee, nominally in the private sector but with members instead of shareholders and its borrowing guaranteed by the government. In 2004, Network Rail took back direct control of the maintenance of the track, signalling and overhead lines, although track renewal remained contracted out to the private sector.