British diesel locomotive created in 1950 by Ashford and Brighton Works. The Southern Railway Series 1020X was the second diesel locomotive in British history, following the LMS Series 1000X. It was also the first locomotive to use eight-axle bogies (basically six-axle bogies with two additional axles added to improve stability). At the time of nationalisation of British Rail the locomotives were still in the design phase. The first two locomotives, 10201 and 10202, operated on Southern Region services. In 1955 both locomotives were transferred to Camden depot in the London Midland Region. The third locomotive, 10203, built in 1954 by Brighton Works, was an improved version of the previous locomotives with a better engine. After a short service with the Southern Region it joined the London Midland Region. Unfortunately, due to the lack of spare parts, the locomotives were withdrawn in 1963 and scrapped in 1968. The eight-axle bogies used in these locomotives were later used in the "Whistler" (Class 40) and "Peak" (Class 45 and Class 46) locomotives.
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