Railtrack was a group of companies that owned the track, signalling, tunnels, bridges, level crossings and all but a handful of the stations of the British railway system from 1994 until 2002. It was created as part of the privatisation of British Rail, listed on the London Stock Exchange, and was a constituent of the FTSE 100 Index. In 2002, after experiencing major financial difficulty, most of Railtrack's operations were transferred to the state-controlled non-profit company Network Rail. The remainder of Railtrack was renamed RT Group plc and eventually dissolved on 22 June 2010.

The privatisation of British Rail was the process by which ownership and operation of the railways of Great Britain passed from government control into private hands. Begun in 1994, the process was largely completed by 1997. The deregulation of the industry was in part motivated by the enactment of EU Directive 91/440 in 1991, which aimed to create a more efficient railway network by creating greater competition.