page_title: 4-4-2 (locomotive)
section_title: Tank locomotives
hierarchical_section_title: 4-4-2 (locomotive) / Usage / United Kingdom / Tank locomotives
caption_attribution_description: Fig. 1 Two Recent Designs of Tank Engines for Fast Train Working London and North Western Railway "Precursor" tank Nº 528
context_page_description: Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 4-4-2 represents a configuration of four leading wheels on two axles, usually in a leading bogie with a single pivot point, four powered and coupled driving wheels on two axles, and two trailing wheels on one axle, usually in a trailing truck which supports part of the weight of the boiler and firebox and gives the class its main improvement over the 4-4-0 configuration.
  This wheel arrangement is commonly known as the Atlantic type, although it is also sometimes called a Milwaukee or 4-4-2 Milwaukee, after the Milwaukee Road, which employed it in high speed passenger working.
context_section_description: The 4-4-2T Atlantic was introduced into the United Kingdom in 1880 by William Adams, who designed the LT&SR 1 Class on behalf of Thomas Whitelegg of the London, Tilbury and Southend Railway (LT&SR). This was the first use of this wheel arrangement in the world. It was intended for heavy suburban trains around London and 36 locomotives were built by Sharp Stewart and Company and Nasmyth, Wilson and Company between 1880 and 1892. Adams later developed the type into his successful suburban 415 class for the London and South Western Railway.
  The LT&SR continued to build 4-4-2 tank locomotives after 1897, with the Class 37, Class 51 and Class 79. Henry Ivatt of the Great Northern Railway (GNR) also built sixty Class C2 tank locomotives between 1898 and 1907, for use on local and commuter trains in Yorkshire and North London.
  During the first decade of the twentieth century, the Atlantic tank locomotive became very popular in the United Kingdom.
  The Great Central Railway’s Class 9K and Class 9L were built between 1903 and 1907. They later became the LNER classes C13 and C14.
  The Great Western Railway’s 2221 Class was built between 1905 and 1912.
  The London and North Western Railway’s Precursor Tank Class was built between 1906 and 1909.
  Four classes were introduced by the London, Brighton and South Coast Railway, the I1 class, I2 class, I3 class and I4 class.
caption: London and North Western Railway Precursor Tank Class
exif: {}