The British Rail Class 488 are unpowered trailer sets, converted from Mark 2F coaches for the Gatwick Express service from London Victoria to Gatwick Airport. The sets were converted from conventional locomotive-hauled coaching stock in 1983–1984, and were used in combination with Class 73 electro-diesel locomotives and Class 489 luggage vans. Two variations were converted: 2-car sets (containing first class accommodation) and 3-car sets (containing standard class accommodation only). They are officially formed of two subclasses. The two-car units are classified as Class 488/2 and are numbered in the range 488201–488210 and the three-car sets are Class 488/3 and are numbered 488301–19. Operations After privatisation, the entire Class 488 fleet passed to the Gatwick Express franchise. One unit, 488301, was withdrawn before privatisation, following an accident at Battersea Park railway station in 1985. Gatwick Express Immediately after privatisation the Class 488 fleet was used exclusively on Gatwick Express trains. They were painted in the Gatwick Express variation of InterCity livery. Some sets were later reliveried with Continental Airlines advertisements, including units 488203/04/07/08/10, 488304/05/10/14/19. From 2000 onwards, new trains in the form of Class 460 units were introduced to replace the old stock. By 2004 just six sets, formed into three 5-car rakes, were still in use with Gatwick Express. By January 2005 this had decreased to four sets. The sets were used sporadically during early 2005 but their use declined as the Class 460 reliability improved. Their final scheduled use was on 28 July following a special trip involving the two remaining Class 73 locomotives. They were replaced by two Class 458 units hired from South West Trains. They were used a few times after this date for emergency cover, but have now been withdrawn. Network Rail After retirement from Gatwick Express several sets were purchased by Network Rail for use as test trains or simply as brake-force runners. These sets have been repainted into either the now obsolete Railtrack blue/lime green livery or the new Network Rail yellow livery. Two sets, 8307 and 8309, have been reclassified as Class 910 departmental units and renumbered 910002 and 910001 respectively. In addition two coaches have been converted for departmental use with Network Rail: 72503 (ex 488204) - converted to hot-box detection coach no. 977983 72715 (ex 488316) - converted to structure-gauging train coach no. 977985 Northern Ireland Railways In 2001 eight carriages were sold to Northern Ireland Railways for further use