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|length = 63ft 2¼"
|weight = 57t
|power = 21,250 lb|pressure = 200 lb/sq in}}
4566 is a GWR Churchward 4500 2-6-2T '[[Whyte notation|Small Prairie]]', a class of small mixed traffic locomotives mainly used on branch lines. They were a common sight on the Severn Valley Branch from the 1920s; the last use there being in 1961.<ref name = "SB9">SVR Stock Book 9th Edition</ref> The class was rated 4MT by British Railways.
