The BR Standard Class 9F 2-10-0 is a class of steam locomotive designed for British Railways by Robert Riddles. The Class 9F was the last in a series of standardised locomotive classes designed for British Railways during the 1950s, and was intended for use on fast, heavy freight trains over long distances. It was one of the most powerful steam locomotive types ever constructed in Britain, and successfully performed its intended duties. At various times during the 1950s, the 9Fs worked passenger trains with great success, indicating the versatility of the design, sometime considered to represent the ultimate in British steam development. Several variants were constructed for experimentation purpose in an effort to reduce costs and maintenance, although these met with varying degrees of success. The total number built was 251, production being shared between Swindon (53) and Crewe Works (198). The last of the class, 92220 Evening Star, was the final steam locomotive to be built by British Railways, in 1960. Withdrawals began in 1964, with the final locomotives removed from service in 1968. Several examples have survived into the preservation era in varying states of repair, including Evening Star.
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