An 0-2-2, in the

Whyte notation Whyte notation is a classification method for steam locomotives, and some internal combustion locomotives and electric locomotives, by wheel arrangement. It was devised by Frederick Methvan Whyte, and came into use in the early twentieth cen ...

for the classification of

steam locomotive A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the loco ...

s by

wheel arrangement In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. Several notations exist to describe the wheel assemblies of a locomotive by type, position, and c ...

, is one that has two coupled

driving wheel On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons (or turbine, in the case of a steam turbine locomotive). On a conventional, non-articulated locomotive, the driving wheels are all coupled ...

s followed by two

trailing wheel On a steam locomotive, a trailing wheel or trailing axle is generally an unpowered wheel or axle ( wheelset) located behind the driving wheels. The axle of the trailing wheels is usually located in a trailing truck. On some large locomotives, ...

s, with no

leading wheel The leading wheel or leading axle or pilot wheel of a steam locomotive is an unpowered wheel or axle located in front of the driving wheels. The axle or axles of the leading wheels are normally located on a leading truck. Leading wheels are used ...

s. The configuration was briefly built by

Robert Stephenson and Company Robert Stephenson and Company was a locomotive manufacturing company founded in 1823 in Forth Street, Newcastle upon Tyne in England. It was the first company in the world created specifically to build railway engines. Famous early locomoti ...

for the

Liverpool and Manchester Railway The Liverpool and Manchester Railway (L&MR) was the first inter-city railway in the world. It opened on 15 September 1830 between the Lancashire towns of Liverpool and Manchester in England. It was also the first railway to rely exclusively ...

Equivalent classifications

Other equivalent classifications are: *

UIC classification The UIC classification of locomotive axle arrangements, sometimes known as the German classification''The Railway Data File''. Leicester: Silverdale, 2000. p. 52. . or German system,Kalla-Bishop P.M. & Greggio, Luciano, ''Steam Locomotives'', Cre ...

: A1 (also known as German classification and

Italian classification The UIC classification of locomotive axle arrangements, sometimes known as the German classification''The Railway Data File''. Leicester: Silverdale, 2000. p. 52. . or German system,Kalla-Bishop P.M. & Greggio, Luciano, ''Steam Locomotives'', Cre ...

) *

French classification Under the French classification system for locomotive wheel arrangements, the system is slightly different for steam and electric/diesel vehicles. Steam The French system counts axles, rather than wheels. As with Whyte notation, a conventional r ...

: 011 *

Turkish classification In the Turkish classification system for railway locomotives, the number of powered axles are followed by the total number of axles. It is identical to the Swiss system except that the latter places a slash between the two numbers. Thus 0-6-0 beco ...

: 12 *

Swiss classification For more than a century, the Swiss locomotive, multiple unit, motor coach and railcar classification system, in either its original or updated forms, has been used to name and classify the rolling stock operated on the railways of Switzerland. ...

: 1/2

Liverpool & Manchester Railway

''Rocket''

The 0-2-2 or ''Northumbrian'' wheel arrangement was first used for Stephenson's ''Rocket'', their entry for the Rainhill Trials of 1829, a competition to choose a locomotive design for the new

Liverpool & Manchester Railway The Liverpool and Manchester Railway (L&MR) was the first inter-city railway in the world. It opened on 15 September 1830 between the Lancashire towns of Liverpool and Manchester in England. It was also the first railway to rely exclusively ...

. Stephenson recognised that the rules of the competition favoured a fast, light locomotive of only moderate hauling power. Although

George Stephenson George Stephenson (9 June 1781 – 12 August 1848) was a British civil engineer and mechanical engineer. Renowned as the "Father of Railways", Stephenson was considered by the Victorians In the history of the United Kingdom and the ...

's previous designs had been heavy four-coupled freight locomotives, ''Rocket'' was almost entirely new. Stephenson was an advocate of the

adhesion railway An adhesion railway relies on adhesion traction to move the train. Adhesion traction is the friction between the drive wheels and the steel rail. The term "adhesion railway" is used only when it is necessary to distinguish adhesion railways from ...

, against the fashion of the time, and believed that the light loads for Rainhill would even allow just a single driving axle. This allowed the simplification of not requiring either a

chain drive Chain drive is a way of transmitting mechanical power from one place to another. It is often used to convey power to the wheels of a vehicle, particularly bicycles and motorcycles. It is also used in a wide variety of machines besides vehicles. ...

between the axles or Stephenson's invention of the external

coupling rod A coupling rod or side rod connects the driving wheels of a locomotive. Steam locomotives in particular usually have them, but some diesel and electric locomotives, especially older ones and shunters, also have them. The coupling rods transfer t ...

s. Achieving adequate traction required more of ''Rocket's'' weight to be over the driving axle than the carrying axle. The heavy boiler was placed forwards, with the axle beneath it, giving a 0-2-2 layout rather than 2-2-0. The

cylinder A cylinder (from ) has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base. A cylinder may also be defined as an ...

s were set at a steep angle, as used the year before for ''

Lancashire Witch ''Lancashire Witch'' was an early steam locomotive built by Robert Stephenson and Company in Newcastle-upon-Tyne in 1828. It was a development of ''Locomotion''. Description ''Lancashire Witch'' was an 0-4-0 locomotive with rear mounted cy ...

'', rather than the typical vertical cylinders of this period. The cylinders were thus over the

firebox Firebox may refer to: * Firebox (steam engine), the area where the fuel is burned in a steam engine * Firebox (architecture), the part of a fireplace where fuel is combusted *Firebox Records, a Finnish 8101705801record label * Firebox.com, an elect ...

and both driver and fireman shared a footplate at the same, rear, end of the engine. Previously they had often been separated to their own ends of the engine.

''Novelty''

Ericsson (lit. "Telephone Stock Company of LM Ericsson"), commonly known as Ericsson, is a Swedish multinational networking and telecommunications company headquartered in Stockholm. The company sells infrastructure, software, and services in inform ...

and

Braithwaite Braithwaite is a village in the northern Lake District, in Cumbria, England. Historically in Cumberland, it lies just to the west of Keswick and to the east of the Grisedale Pike ridge, in the Borough of Allerdale. It forms part of the ...

's entry for the Trials, their ''

Novelty Novelty (derived from Latin word ''novus'' for "new") is the quality of being new, or following from that, of being striking, original or unusual. Novelty may be the shared experience of a new cultural phenomenon or the subjective perception of an ...

'', was an 0-2-2 well tank locomotive. Both the

s and

s were the same size, and there may also have been the facility to fit a coupling chain drive to give better adhesion 'when needed'. ''Novelty'' has also been described as a 2-2-0WT design, as there is no clear 'front' or 'rear' to this design.

''Northumbrian''

''Rocket'' was the only locomotive to complete the trials successfully and Stephenson became the supplier of locomotives to the L&MR. The 0-2-2 arrangement was subsequently used by

on eight locomotives supplied to the

after 1829:, ''Meteor'', ''Comet'', ''Dart'', ''Arrow'', ''Phoenix'', ''North Star'', '' Northumbrian'', and ''Majestic''. Like the rebuilt ''Rocket'', these had their cylinders set low in a near-horizontal position. The ''Northumbrian'' type was superseded by the

2-2-0 Under Whyte notation for the classification of steam locomotives, 2-2-0 represents the wheel arrangement of two leading wheels on one axle, two powered driving wheels on one axle, and no trailing wheels. This configuration, which became ...

''Planet'' type. These reversed the layout, placing the cylinders inside, between the frames, and below the

smokebox A smokebox is one of the major basic parts of a steam locomotive exhaust system. Smoke and hot gases pass from the firebox through tubes where they pass heat to the surrounding water in the boiler. The smoke then enters the smokebox, and is e ...

at the front. The inside cylinders were closer together, giving less of a rocking couple and so were less prone to yawing oscillation at speed. Placing the cylinders below the smokebox also permitted shorter steampipes and exhaust pipes to the

blastpipe The blastpipe is part of the exhaust system of a steam locomotive that discharges exhaust steam from the cylinders into the smokebox beneath the chimney in order to increase the draught through the fire. History The primacy of discovery of th ...

, giving better efficiency. ''Northumbrians'' were the last, and only, production locomotives with this wheel arrangement. After the ''Planets'', most passenger locomotives began to use a

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 arrangemen ...

arrangement, with an additional front carrying axle to give better riding at speed.

Tank engines

In the early 20th Century a number of

railmotor Railmotor is a term used in the United Kingdom and elsewhere for a railway lightweight railcar, usually consisting of a railway carriage with a steam traction unit, or a diesel or petrol engine, integrated into it. Steam railcars Overview In th ...

s were built by various railway companies in the UK where the locomotive section had an 0-2-2 wheel arrangement, but they were designed to operate semi-permanently coupled to a coach unit. The LSWR C14 class used a similar layout, but reversed as a 2-2-0T. Their low adhesive weight gave them a poor performance and half of them were rebuilt as the 0-4-0T S14.

References

{{Whyte types, state=collapsed 0-2-2 locomotives 2,0-2-2