2-2-2


Under the Whyte notation for the classification of steam locomotives, 2-2-2 represents the wheel arrangement of two leading wheels on one axle, two powered driving wheels on one axle, and two trailing wheels on one axle. The wheel arrangement both provided more stability and enabled a larger firebox than the earlier 0-2-2 and 2-2-0 types. This wheel arrangement is sometimes described as a Single, although this name could be used to describe any kind of locomotive with a single pair of driving wheels.

Equivalent classifications

Other equivalent classifications are:
  • UIC classification: 1A1
  • French classification: 111
  • Turkish classification: 13
  • Swiss classification: '''1/3'''

    History

The 2-2-2 configuration appears to have been developed by Robert Stephenson & Company in 1834, as an enlargement of their 2-2-0 Planet configuration, offering more stability and a larger firebox. The new type became known as Stephenson's Patentee locomotive. Adler, the first successful locomotive to operate in Germany, was a Patentee supplied by Robert Stephenson & Company in component form in December, 1835 was one of the earliest examples. Other examples were exported to the Netherlands, Russia and Italy. By 1838 the 2-2-2 had become the standard passenger design by Robert Stephenson & Company.
Eighteen of the first nineteen locomotives ordered by Isambard Kingdom Brunel for the opening of the Great Western Railway in 1837/8 were of the 2-2-2 type. These included six 2-2-2 locomotives built by Charles Tayleur at his Vulcan Foundry. Also in 1837 the successful North Star broad gauge locomotive was delivered to the Great Western Railway by Stephenson, becoming the first of a class of twelve locomotives by 1841.
File:North Star photograph.jpg|thumb|Great Western Railway North Star at Swindon

Later UK developments

constructed more than 600 2-2-2 locomotives between 1837 and 1857. Ten of these supplied to the Grand Junction Railway became the basis of Alexander Allan's successful designs for the railway from 1845. John Rennie supplied 2-2-2 locomotives to the London and Croydon Railway from 1838 and the London and Brighton Railway in 1840. Arend was one of the two first steam locomotives in the Netherlands, built by R. B. Longridge and Company of Bedlington, Northumberland in 1839.
The Great Western Railway continued to order both broad gauge and standard gauge locomotives on the railway, including the Firefly and Sun classes, which were enlarged versions of North Star. Bury, Curtis and Kennedy supplied six 2-2-2 locomotives to the Bristol and Gloucester Railway in 1844, and fourteen to the Great Southern and Western Railway in Ireland in 1848,, both for the Great Western Railway. James Holden of the Great Eastern Railway created some 2-2-2 singles in 1889 by removing the coupling rod from a 2-4-0.

Belgium

The first steam railway locomotive built in Belgium in 1835, and was built by John Cockerill under license to a design by Robert Stephenson & Company It was built for use on the first main line on the European mainland, the Brussels-Mechelen line. A replica was built at the workshops of Boissellerie Cognaut for the 150th anniversary of the formation of Belgium. Brussels-Mechelen line

Italy

Two 2-2-2 locomotives were imported from Longridge and Co of Bedlington Ironworks England for the Naples–Portici railway in 1839 named Bayard and Vesuvio. A replica of 'Bayard is at the Naples Railway Museum.

Germany

Most of the earliest locomotives to operate in what is now Germany before the mid-1840s were 2-2-2s delivered by UK manufacturers. However, by 1839 the type was also being built locally see List of Bavarian locomotives and railbuses. The Pegasus of 1839 was the first locomotive to be built by the Sächsische Maschinenbau-Compagnie in Chemnitz. August Borsig and Company manufactured Beuth in 1843 which was highly successful; its valve design became de facto standard for locomotives for decades to come. By 1846 he had manufactured more than a hundred similar locomotives. Both the Leipzig-Dresden Railway and Royal Bavarian State Railways built several 2-2-2 classes 1841–1859. Similarly, the Grand Duchy of Mecklenburg Friedrich-Franz Railway grouped various 2-2-2 steam locomotives procured from German manufacturers between 1848 and 1863 into its Mecklenburg I class.

Austria

The Imperial Austrian State Railways built two successful locomotives of this wheel arrangement in 1907. Similarly the Federal Railway of Austria built two examples of an express tank locomotive in 1934 and 1937.

Latvia

One of last 2-2-2 tank locomotives were ordered by Latvian Railways, for local traffic. The locomotives Tk class were designed by German Hohenzollern, and 20 were manufactured in Germany and Latvia in 1928–1934. They were next seized by Soviet railways. After World War II one served in Poland as OKa1 class.Image:PioneerLocomotiveSmithsonian.jpg|thumb|right|The locomotive "Pioneer" in service on the Cumberland Valley Railroad in the 1880s or 1890s.

Preserved examples and replicas