was restored in March 2004. Following the derailment, a joint report by London Underground and its maintenance contractor Tube Lines concluded that poor track geometry was the main cause of the derailment. Extra friction arising out of striations (scratches) on a newly installed set of points had allowed the leading wheel of the last carriage to climb the rail and therefore derail. The track at the derailment site is on a very tight bend in a tight tunnel bore, which prevents canting the track by dipping the height of one rail relative to the other, the normal solution in this sort of situation. Future expansion and upgrade The station is too small for current passenger demand, with just two escalators and too few passageways between Northern line platforms. The station is particularly busy at weekends with tourists visiting Camden Market and Camden High Street, with entry to the station prohibited on Sunday afternoons to prevent overcrowding on the station's narrow platforms. By 2021, weekday passenger demand at the station is expected to grow by 40 per cent. London Underground originally submitted redevelopment plans in the early 2000s, a £130m project that would have eased congestion and provided step free access – with residential and office development above the new station. However, the project involved demolition of all buildings between Buck Street, Camden High Street and Kentish Town Road – including Buck Street Market, Electric Ballroom and the ox-blood tiled Leslie Green station building itself. London Underground's reasoning was that land was required for a temporary entrance for the station while the new station was built. Complaints regarding the loss of these buildings and the market – as well as complaints regarding out-of-place and out-of-scale development when compared to the remainder of Camden Town – led to a public inquiry, which was held in 2004. In 2005, Transport for London had their Transport and Works Act order refused by the office of the Deputy Prime Minister and the scheme was subsequently cancelled. In 2013, TfL announced new redevelopment plans given the continuing congestion and high passenger demand at the station. Instead of the previously aborted scheme, TfL proposed a new station building built on the north side of Buck Street, on the site of the vacated Hawley School, avoiding the need to demolish both the original station and the other previously-threatened buildings. As well as this new station entrance, expansion work