Island Line Trains is a sub-brand of South West Trains, a train operating company on Great Britain's National Rail Network, operating the 8½ mile Island Line on the Isle of Wight. Standard National Rail vehicle types cannot be used by Island Line Trains, due to the low ceiling of Ryde Tunnel.[5] Instead, services are operated using Class 483 units, which are refurbished ex-London Underground tube trains originally built in 1938. These replaced the older Class 485 and Class 486 units, which dated from 1923 and were introduced to the island in 1967 when the line was electrified. When the Class 483 trains were introduced, they were painted in the standard Network Southeast livery. In 2000, several years after the start of the original franchise, the stock was painted into a blue livery with large pictures of dinosaurs, aiming to entice tourists in the summer months when passenger numbers are high. Two units were later painted into London Transport colours, which the units would have had when operating on the London Underground. There are yellow warning panels on the front ends of the units, a modern feature for the benefit of track workers and a change compared with the original red. The entire fleet was repainted into this livery by the end of 2008. Following its successful bid for the new integrated franchise, South West Trains announced that there were no plans to replace the current rolling stock, instead they would invest "to ensure the continued viability of the existing Island Line rolling stock and infrastructure" By 2016, when the current franchise is due to end, the rolling stock will be almost 80 years old. The five current Class 483 trains have recently benefited from a further refurbishment, the work featured the following: An exterior repaint into London Transport maroon with cream window pillars A retrim of the seat moquette into the same moquette that the London Underground A60/62 Surface Stock received during their refurbishment between 1992–94 New route maps in green. The stations have not been neglected either, they also have benefited from a refurbishment of the following: New tarmac platforms. New seating in green and cream. New waiting shelters. New 'heritage' style station name boards