page_title: GWR 4100 Class
section_title: Atbara class
hierarchical_section_title: GWR 4100 Class / Atbara class
caption_attribution_description: English: Atbara Class locomotive no. 3373, temporarily renamed Royal Sovereign, when it hauled the Royal Funeral Train from Paddington on 2 February, 1901.
context_page_description: The GWR 4100 Class was a class of steam locomotives in the Great Western Railway of the United Kingdom.
  The Badminton class express passenger 4-4-0 steam locomotives were introduced in 1897 as a development from the earlier Duke class. The name Badminton was chosen after the Duke of Beaufort's Badminton estate, through which the GWR was building a new line to South Wales at the time.
  Further modifications to the design resulted in the Atbara Class entering service in 1900, the names for these locomotives generally being taken from contemporary military engagements or senior army commanders. Later engines were named after cities of the British Empire.
  The final batch of locomotives were named after varieties of garden plant and in consequence were known as the Flower Class.
  These three types were later standardised and treated as a single class, so are listed together here. Four other prototype 4-4-0s, originally built in 1894 as the Armstrong Class, were also later rebuilt as Badmintons.
  This class were subject to the 1912 renumbering of GWR 4-4-0 locomotives, which saw the Bulldog Class gathered together in the series 3300-3455, and other types renumbered out of that series.
context_section_description: No. 3373 Atbara was built in April 1900, the first of a class of forty locomotives. Instead of the curved outside frames of the Badmintons, this class had straight-topped frames, which became the standard pattern for all subsequent outside-framed 4-4-0s. These straight frames were less prone to fracturing, because of the greater depth of plate between the coupled wheels. The Atbaras retained the Stroudley crank layout, cylinders, valves and valve gear of the Badmintons, but differed in the boiler, which was a parallel domeless Standard No. 2 type. No. 3405 Mauritius was reboilered in September 1902 with a tapered boiler, a prototype for the Standard No. 4 type. It was the first GWR 4-4-0 to be fitted with a tapered (or coned) boiler. Following this, another nine Atbaras, nos. 3400 to 3404 and 3406 to 3409, were rebuilt with No. 4 boilers between February 1907 and February 1909. The ten were added to the City Class. No. 3382 Mafeking was heavily damaged in an accident on 24 June 1911. Adjudged unrepairable, it was withdrawn in September 1911, so was not included in the 1912 renumbering. The remaining Atbaras were withdrawn between April 1927 and May 1931.
caption: Atbara Class locomotive no. 3373, in Royal Sovereign livery, on February 2, 1901.
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