The British Rail Class 483 electric multiple units were originally built as 1938 tube stock units for London Underground. They were extensively refurbished between 1989 and 1992 by Eastleigh Works, for use on services on the Isle of Wight's Island Line. This was despite having already been used for nearly 50 years on the London Underground network. The units replaced the even older and life-expired British Rail Classes 485 and 486 units which were introduced in 1967, but were originally built as 'Standard' stock units for the London Electric Railway in 1923. The trains were 83 years old when they were withdrawn in January 2021; they were the oldest passenger trains in Great Britain remaining in regular passenger service at the time. They were withdrawn on 3 January 2021, with the line closed from 4 January until 1 November 2021 for upgrade works, after which they were replaced by Class 484s. Of the six units present on the Island at the time of their withdrawal, all have been confirmed for preservation. History Prior to Isle of Wight service The trains were originally built by Metro-Cammell as 1938 tube stock for London Underground. An initial batch was withdrawn from service in 1973, and they were considered for use on the Island Line (which would not bear that name for another 16 years). However, the under-floor equipment was thought to be a problem, as extensive adaptations would be needed to Ryde Works to allow fitters to access it. It was also felt that the under-floor equipment would be vulnerable to salt water damage on Ryde Pier, especially in bad weather. The last batch of 1938 stock was withdrawn in 1985, except for five trains required on the Northern line between 1986 and May 1988 due to increasing passenger numbers. In 1987, Network SouthEast (NSE) managers realised that the existing 1923-built trains would not be economically serviceable beyond around 1990 and thoughts turned to the future of the line. After closure of the route was discounted, it was decided to purchase and refurbish 1938 stock. In April 1988, London Underground offered a total of 28 carriages in revenue-earning condition to NSE, joined by three further carriages in May 1989. In addition, between May 1988 and October 1990, four scrap vehicles and nine works vehicles, to be used for spare parts, were taken from LU's Ruislip depot. While the project's feasibility study suggested that