Cross River Tram (formerly Cross River Transit) was a Transport for London (TfL) proposal for a tram system in London. It was planned to run on a north–south route from Camden Town in the north, via King's Cross, to Peckham and Brixton in the south. The Cross River Tram scheme was proposed to relieve overcrowding on the London Underground and was due to begin operation by 2016. The project was cancelled by then mayor of London Boris Johnson in 2008 due to funding problems. A 2016 review of the CRT plan by subsequent mayor Sadiq Khan concluded that the CRT project would not be reopened at that time. Overview The tram was planned to relieve overcrowding on the London Underground, and to improve transport in areas currently without good public transport, such as the Aylesbury Estate in Southwark, to support regeneration. Trams would have run up to every 4 minutes on each branch, giving a 2-minute service through central London at peak times. Despite following the same route, it was not envisaged that the Cross River Tram line would use the former Kingsway tramway subway. Cancellation On 18 July 2007, Mayor of London Ken Livingstone told the London Assembly that he had asked TfL to consider splitting the implementation by building the southern section in advance of the northern section; it was not, however, clear where such a split would be. In May 2008, Livingstone's successor as mayor, Boris Johnson, announced that he intended to review the project in light of the lack of central government funding for the planned route. On 6 November 2008, Transport for London announced that the Cross River Tram would not be built. In a statement, it said: "Given the lack of funding available to implement the project and the likelihood of not securing additional third party funding, TfL is not in a position to develop the scheme any further." The £1.3bn project was cancelled in 2008 as part of a move to save £2.4bn of transport-related funds. Official announcements from TfL in 2009 stated that the project was "on hold", and that TfL would be explore alternative schemes, including increased capacity on Underground lines. In June 2016, Caroline Russell, a Green Party member of the London Assembly, asked new mayor of London Sadiq Khan to review the business case for a tram service via Waterloo Bridge and Elephant & Castle. Khan subsequently stated that