Under the Whyte notation for the classification of steam locomotives, 2-4-2 represents the wheel arrangement of two leading wheels on one axle, four powered and coupled driving wheels on two axles and two trailing wheels on one axle. The type is sometimes named Columbia after a Baldwin 2-4-2 locomotive was showcased at the 1893 World's Columbian Exposition held at Chicago, Illinois.

2-4-2 (Columbia)
Diagram of a single small leading wheel, two large coupled wheels and a single small trailing wheel
Raahe track 2-4-2T, Finland
Equivalent classifications
UIC class1B1, 1'B1'
French class121
Turkish class24
Swiss class2/4
Russian class1-2-1
First known tank engine version
First use1863
CountryUnited Kingdom
LocomotiveNo. 21 White Raven
RailwaySt Helens Railway
DesignerJames Cross
BuilderSutton Works
First known tender engine version
First use1877
CountryNew Zealand
LocomotiveK class
RailwayNew Zealand Railways
BuilderRogers Locomotive Works


The wheel arrangement was widely used on passenger tank locomotives during the last three decades of the nineteenth and the first decade of the twentieth centuries. The vast majority of 2-4-2 locomotives were tank engines, designated 2-4-2T. The symmetrical wheel arrangement was well suited for a tank locomotive that is used to work in either direction.

When the leading and trailing wheels are in swivelling trucks, the equivalent UIC classification is 1'B1'.

While a number of 2-4-2 tender locomotives were built, larger tender locomotive types soon became dominant.


Cape of Good HopeEdit

In 1899, the Walvis Bay Railway in the British territory of Walvis Bay, a Cape of Good Hope exclave in Deutsch-Südwest-Afrika (German South West Africa), placed a single tank locomotive in service. The engine, named Hope and built by Kerr, Stuart and Company, remained in service until 1904 when operations on the railway were suspended. The line was abandoned in 1905, partly as a result of being buried by a sandstorm.[1][2]


A 2-4-2 tank locomotive, built by Baldwin Locomotive Works in 1899 and used on the private Raahe track in Finland, was later bought by the Finnish State Railways.

New ZealandEdit

K class no. K88 Washington

In 1877, when the New Zealand Railways needed new motive power, the road turned to the Rogers Locomotive Works who supplied eight 2-4-2 tender locomotives between 1877 and 1879 that were designated the "K" class. These were the first American-built locomotives in New Zealand and proved to be quite successful.

Three of these locomotives have been preserved. No. K88 Washington was used on the first through train between Christchurch and Dunedin in 1877. After fifty years of service, Washington was dumped in the Oreti River, Southland, as a flood protection measure. In 1974, the locomotive was exhumed from her watery grave and, over the next eight years, restored to full active service.

Sister locomotives numbers K92 and K94 have also been salvaged from the Oreti river. No. K92 has been restored to full active service and has re-established her position on the Kingston Flyer train, which was made famous by the K class at the end of the 19th century.

United KingdomEdit

London and North Western Railway 2-4-2T

The earliest British use of the 2-4-2 wheel arrangement appears to have been no. 21 White Raven, supplied to the St Helens Railway by James Cross of Sutton Works in 1863. It was soon rebuilt as a 2-4-0 tender locomotive and eventually passed into the stock of the London and North Western Railway (L&NWR).[3]

In 1864, Robert Sinclair of the Great Eastern Railway designed the first of six 2-4-2 tank classes built by the railway, eventually totalling 262 locomotives by 1912.

Francis Webb of the London and North Western Railway also designed two 2-4-2 classes which eventually totaled 380 locomotives, built between 1879 and 1898.

Other railway companies that built large numbers of the type included the Lancashire and Yorkshire Railway (L&YR) with 330 locomotives built between 1889 and 1911, the North Eastern Railway with 60 locomotives built between 1886 and 1892 and the Manchester, Sheffield and Lincolnshire Railway with 49 locomotives built between 1889 and 1898. One of John Aspinall's Class 5 locomotives, built for the L&YR in 1889, is preserved at the National Railway Museum, York.

United StatesEdit

The tank-type 2-4-2T was not uncommon in the U.S. around the dawn of the twentieth century in both suburban passenger service and on logging railroads. The Baldwin Locomotive Works built a demonstrator tender type engine which was displayed at the Columbian Exposition of 1893. This led to the type's name. This locomotive featured ambitious seven foot tall driving wheels, and was one of the first tender-equipped locomotives with a trailing truck. This freed the firebox from having to sit narrowly between, or above, the drive wheels, and was a very influential design.

This inspired three major U.S. railroads (Atlantic Coast Line, Burlington and Reading) to purchase a few of the type. But the two-wheeled lead truck was never well-suited to high speed service on far-flung North American rails. Some were converted to 4-4-2 Atlantic types and others were converted to 4-6-0 Ten Wheelers. The display locomotive was donated to Columbia University. In one respect, however, it was a success. A great many Atlantic types would follow, most based on the design.[4]

In fictionEdit

The character Sammy from Sammy the Shunter is based on the United Kingdom design of the 2-4-2 engine. Two characters in the 1991 film The Little Engine That Could have this type of wheel arrangement. Albert from The Railway Series has this wheel arrangement.

Model railroadingEdit

The Lionel Corporation used the 2-4-2 configuration in numerous of its O-27 locomotives.[5] In the United States of America, this may be the most famous usage of a 2-4-2 configuration locomotive.


  1. ^ Espitalier, T.J.; Day, W.A.J. (1948). The Locomotive in South Africa - A Brief History of Railway Development. Chapter VII - South African Railways (Continued). South African Railways and Harbours Magazine, January 1948. p. 32.
  2. ^ Dulez, Jean A. (2012). Railways of Southern Africa 150 Years (Commemorating One Hundred and Fifty Years of Railways on the Sub-Continent – Complete Motive Power Classifications and Famous Trains – 1860–2011) (1st ed.). Garden View, Johannesburg, South Africa: Vidrail Productions. p. 379. ISBN 9 780620 512282.
  3. ^ Baxter, Bertram (1978). British Locomotive Catalogue 1825-1923. 2A. Moorland Publishing. p. 48. ISBN 9780903485517. OCLC 877634366.
  4. ^ "Baldwin 2-4-2 "Columbian" Locomotives in the USA".
  5. ^ Identifying Lionel Electric Trains – Locomotives (Accessed on 18 September 2016)