units underwent a refresh of both the interior and exterior. Some of the noticeable changes included the addition of the new "Barman" seat moquette, new brighter interior lighting and the installation of new window frames. The front of the driving cabs were also refreshed. This included repairing water ingress and replacing a large number of parts with a much simpler design, saving costs on future work and cleaning up the appearance of the front end. The new-style front end can be easily identified by the new red panelling installed on most units instead of the original grey. The refresh came after nearly twenty years of continuous service on the Central line. TfL is planning a major refurbishment on the Central line units as part of the Central Line Improvement Programme(CLIP). This includes a complete overhaul of the interior and adding new features such as new wheelchair spaces, PIS (Passenger Information Screens) and CCTV installed throughout the train. The London Underground corporate livery will also be repainted on these units as well as the replacement of the current traction motors. Work started in 2019 and has been shown to be heavily delayed for health and financial reasons. A test train was spotted in March 2022. Interior compenents are known to be working as of 26 April 2022. Waterloo & City line units In 2006, the Waterloo & City line was closed for several months to allow for track and signalling upgrade works. During this period, the 1992 Stock units in use on the line were removed by crane from Waterloo depot and taken by road to Wabtec Rail in Doncaster for refurbishment. External changes included repainting the trains, which were still in Network SouthEast livery, into London Underground's corporate livery. Internally, the handrails were repainted from Central line red to Waterloo & City line turquoise, new seat moquette was fitted and CCTV cameras were installed. Later, the units received the new "Barman" moquette fitted to the Central line units, but not the new lighting, window frames or front end. Future replacement In October 2014, it was announced that the 1992 stock would be replaced by a new semi-articulated model referred to as the New Tube for London (NTfL). This has since slipped to 2025. While a cancellation or deferring was never officially announced, it has been implied that the initial order is now only for replacing the 1973 Stock on the