page_title: 4-2-4T
section_title: United Kingdom
hierarchical_section_title: 4-2-4T / Usage / United Kingdom
caption_attribution_description: A Broad gauge 4-2-4 Tank engine of the Bristol and Exeter Railway. They were designed by the B&amp;ER's Locomotive Superintendent, James Pearson and had 9ft driving wheels. This photo was taken from an old original photo we came across while helping to clear the house of a deceased friend. I have uploaded it to Flickr in the hope that it might be interesting to steam enthusiasts.
context_page_description: Under the Whyte notation for the classification of steam locomotives, 4-2-4 represents the wheel arrangement of four leading wheels on two axles, two powered driving wheels on one axle, and four trailing wheels on two axles. This type of locomotive is often called a Huntington type.
  The configuration was most often used for tank engines, which is noted by adding letter suffixes to the configuration, such as 4-2-4T for a conventional side-tank locomotive, 4-2-4ST for a saddle-tank locomotive, 4-2-4WT for a well-tank locomotive and 4-2-4RT for a rack-equipped tank locomotive.
context_section_description: The first eight known 4-2-4 locomotives entered service on the broad gauge Bristol and Exeter Railway in 1853 and 1854, numbered in the range from 39 to 46. They had 9 feet (2,743 millimetres) diameter flangeless driving wheels, supported by leading and trailing two-axle bogies. The water was carried in both well- and back-tanks. Two more engines were built in 1859 and 1862, but with much smaller 7 feet 6 inches (2,286 millimetres) diameter driving wheels.
  Between 1869 and 1873, new locomotives were built to replace four of the original 9 feet (2,743 millimetres) diameter driving wheeled engines, re-using the engine numbers of the locomotives being replaced. These four replacement engines had slightly smaller 8 feet 10 inches (2,692 millimetres) diameter driving wheels.
  In 1881, this wheel arrangement was also used by the Great Western Railway on William Dean's experimental locomotive no. 9. Since it was so prone to derailing as to be unable to be moved from the workshops where it was built, it did no work and was rebuilt to a 2-2-2 tender locomotive in 1884. Dugald Drummond of the London and South Western Railway built a 4-2-4T F9 class combined locomotive and inspection saloon in 1899. It was little used after Drummond's death in 1912.
caption: The second B&ER no. 40 of 1873
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