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2857 is a GWR Churchward 2800 Class locomotive, designed for heavy freight work. The [[GWR Power and Weight Classification]] were class E and axle load Blue respectively. It is fitted with the GWR 'Std. 1' boiler, which was also fitted to the 2900, 4000, 4900, 6800 and 6959 classes. During World War II some classes of locomotives were permitted to haul loads heavier than those specified in the working books for their power classification, distinguished by the white letter "X" painted above 2857's number plate.<ref>[https://www.svrwiki.com/GWR_Power_and_Weight_Classification Wikipedia]</ref> Post-war the class was rated 8F by BR.