page_title: GWR 5100 Class
section_title: 8100 class
hierarchical_section_title: GWR 5100 Class / 8100 class
caption_attribution_description: English: GWR 8100 Class 2-6-2T 8103 at Carmarthen shed
context_page_description: The Great Western Railway GWR 5100 Class was a class of 2-6-2T side tank steam locomotives. It was the first of a series of broadly similar classes used principally for suburban passenger services.
context_section_description: In 1938/9 ten members of the 5100 series were rebuilt with 5 feet 6 inches (1.676 m) driving wheels and 3-foot pony truck wheels. They retained the number 2 boiler, but again pressed to 225 psi as in the 6100. Numbers 5100 (the original 1903 prototype number 99 now being renumbered for the third time), 5123, 5118, 5145, 5124, 5126, 5120, 5116, 5133 and 5115, were renumbered 8100 to 8109. This 8100 class were intended to bolster the 6100 class on London suburban duties, with the smaller driving wheels giving a supposed benefit of better acceleration. Whatever the practical advantage in performance, the class became widely dispersed and locos were used alongside their predecessors indiscriminately.
  None of the 8100 class have been preserved.
caption: 8100 Class rebuild 8103 (ex 5145) at Carmarthen loco shed on 16 April 1961
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