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Other routes served included the Steyning Line between Brighton and Horsham, which closed in 1967 the Cuckoo Line, which closed in 1968 the Lymington Branch Line, which was served by the units for two months in 1967 prior to its electrification and some journeys on the Oxted Line, which was also served by the newer Class 207 units. The units also operated on the Wareham to Swanage route from 1966 until its closure in 1972. All of these routes except for the Marshlink Line had been closed by 1967, by which time the route between Reading and Salisbury was also operated by the class. These units also ran on the Bexhill West Branch Line and the short line to New Romney and Littlestone-on-Sea, and a Sunday-only service on the Fawley Branch Line. The delivery of the second batch of four units saw the class introduced to the Marshlink Line between Ashford and Hastings. The new services proved so popular that the class was temporarily taken off the route to Alton and Andover to provide extra capacity on the other lines prior to the fitting of a third carriage to the first 18 units. Journey times were around two-thirds of those required by the steam locomotives which the units replaced. They were initially used on services linking Portsmouth and Southampton to Salisbury, as well as those between Southampton and Portsmouth Harbour and from Southampton to Alton/Andover. The first examples of the class entered service in September 1957 after a month of testing. Number 1129 was experimentally fitted with a Dorman 12QTCW V-12 diesel engine of 725 shp (541 kW)
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Driving wheel diameter: 42 in (1,067 mm).Maximum tractive effort: 12,500 lbf (56 kN).Transmission: Electric, two English Electric type EE507 traction motors rated at 250 hp (190 kW) each.Engine: English Electric 4-cylinder type 4SRKT Mark II of 600 bhp (450 kW) at 850 rpm.Weight: 56 t (55.1 long tons 61.7 short tons).The final batch of units is sometimes referred to as Berkshire sets. They were built for services from Reading to Salisbury, and other services in Berkshire.
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These units have some detail differences from the earlier batches, such as a different internal layout, and smaller route indicators (compare the two photos). The final batch of units, numbered 1127–1133, was built in 1962 as three car sets. Collectively, the first and third batches are often called Hampshire sets. These units were built to supplement the first batch on services in Hampshire. The third batch of units was built as three-car sets in 1959, and numbered 1123–1126. In May 1979, following the disbandment of the four Class 206 units, they were strengthened to three cars and redesignated as Class 205s. These units remained as two-car sets until 1979, and were reclassified as Class 204 upon the introduction of TOPS. These units were built for services on the Marshlink Line from Hastings to Ashford, and associated branch lines. The second batch of 2H units, numbered 1119–1122, was built as 2-car units in 1958. Some of these were later converted back to 2 car sets, but they retained their Class 205 designation.
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Upon the introduction of TOPS they were reclassified as Class 205. However, owing to increasing passenger numbers, all eighteen units were strengthened to three cars in 19, with the addition of a centre trailer, and therefore were reclassified as 3H units. The first units entered service in September 1957. They were built for services in Hampshire on the non-electrified routes between Portsmouth Harbour, Salisbury and Andover and between Alton, Winchester and Southampton Terminus. The first batch of units, numbered 1101–1118, was built in 1957 as two-car units and classified as 2H. The Southern Region class 201 to 207 DEMUs are nicknamed 'Thumpers' owing to the noise they made while in motion. This class of unit was built in four different batches for use on different lines.