all Central trains along this to Uxbridge, as West Ruislip station is located in a quiet suburb and Uxbridge is a much more densely populated regional centre. TfL has stated that the link will be impossible until the Metropolitan line's signalling is upgraded in 2017. The Central line was the first Underground line to receive a complete refurbishment in the early 1990s, including the introduction of new rolling stock. A new generation of deep-level tube trains, as well as signalling upgrades, is planned for the mid-2020s, starting with the Piccadilly line, followed by the Bakerloo line and the Central line. The proposed Crossrail 2 line, running from south-west to north-east London and due to open by 2030, was planned for a number of years to take over the Epping branch of the Central line between Leytonstone and Epping. As of 2013 the preferred route options for the line no longer include this proposal. The Central line runs directly below Shoreditch High Street station and an interchange has been desired locally since it opened in 2010. The station would lie between Liverpool Street and Bethnal Green, one of the longest gaps between stations in inner London. Although there would be benefits to this interchange, it was ruled out on grounds of cost, the disruption it would cause to the Central line while being built and because the platforms would be too close to sidings at Liverpool Street and would not be developed until after Crossrail is fully operational. The developers of the First Central business park at Park Royal, west London, were planning a new station between North Acton and Hanger Lane. This would have served the business park and provided a walking distance interchange with Park Royal station on the Piccadilly line. This is not being actively pursued; London Underground said that the transport benefits of a Park Royal station on the Central line are not sufficiently high to justify the costs of construction. References Notes Bibliography External links Central line facts – Transport for London page with line facts and brief history Clive's Underground Line Guide A History of the London Tube Maps – 1914 tube map showing proposed extension to Gunnersbury Epping Ongar Railway – The company currently owning the Epping and Ongar branch and running trains on it. London Underground lines Railway lines opened in 1900 Transport in the London Borough of Hillingdon Transport in the London