# 2-2-2-0

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Locomotive wheel arrangement

[LNWR Webb *Experiment* class](/source/LNWR_Webb_Experiment_Class) 1120 *Apollo*: one carrying axle and two driving axles

LNWR 2+2-2-0 No 189 at [Curzon Street, Birmingham](/source/Birmingham_Curzon_Street_railway_station_(1838%E2%80%931966)), circa 1859: two carrying axles, one driving axle

Under the [Whyte notation](/source/Whyte_notation) for the classification of [steam locomotives](/source/Steam_locomotive), **2-2-2-0** usually represents the [wheel arrangement](/source/Wheel_arrangement) of two [leading wheels](/source/Leading_wheel) on one axle, four powered but uncoupled [driving wheels](/source/Driving_wheel) on two axles, and no [trailing wheels](/source/Trailing_wheel), but can also be used to represent two sets of leading wheels (not in a [bogie](/source/Bogie)) two [driving wheels](/source/Driving_wheel), and no [trailing wheels](/source/Trailing_wheel). Some authorities place brackets around the duplicated but uncoupled wheels, creating a notation 2-(2-2)-0,[1] or (2-2)-2-0,[2] as a means of differentiating between them. Others simply refer to the locomotives 2-2-2-0.[3]

## Usage

The 2-2-2-0 wheel arrangement was first used on some locomotives introduced on the [Eastern Counties Railway](/source/Eastern_Counties_Railway) by [John Chester Craven](/source/John_Chester_Craven) between 1845 and 1847, and some [Crampton locomotives](/source/Crampton_locomotive) on the [South Eastern Railway](/source/South_Eastern_Railway%2C_UK) in 1849.[4] However the 2-2-2-0 type is usually associated with [Francis Webb](/source/Francis_Webb_(engineer)) of the [London and North Western Railway](/source/London_and_North_Western_Railway) who between 1882 and 1890 introduced a number of [compound locomotive](/source/Compound_locomotive) classes including the [LNWR Webb Experiment Class](/source/LNWR_Webb_Experiment_Class), [LNWR Dreadnought Class](/source/LNWR_Dreadnought_Class) and [LNWR Teutonic Class](/source/LNWR_Teutonic_Class). The locomotives were never reliable and Webb's successor [George Whale](/source/George_Whale) withdrew them all within three years of taking up office in 1903.[5] The [Pennsylvania Railroad](/source/Pennsylvania_Railroad) had [one engine](/source/Pennsylvania_Railroad_no._1320) based on the LNWR compounds which proved to be underpowered and was scrapped in 1897. The type was used with more success on French railways with a 4-cylinder [compound locomotive](/source/Compound_locomotive) designed by [Alfred de Glehn](/source/Alfred_de_Glehn), of the [Société Alsacienne de Constructions Mécaniques](/source/Soci%C3%A9t%C3%A9_Alsacienne_de_Constructions_M%C3%A9caniques) (SACM) in 1885. One [later example](/source/Nord_2.121_to_2.180) was of the [4-2-2-0](/source/4-2-2-0) configuration but it was eventually rebuilt as a [4-4-0](/source/4-4-0) instead.[6]

## References

1. **[^](#cite_ref-Baxter1_1-0)** Baxter, Bertram (1977). *British locomotive catalogue 1825-1923*. Vol. 1. Buxton: Moorland Publishing. p. 12. [ISBN](/source/ISBN_(identifier)) [978-0-903485-50-0](https://en.wikipedia.org/wiki/Special:BookSources/978-0-903485-50-0).

1. **[^](#cite_ref-2)** Baxter, pp.45 & 67.

1. **[^](#cite_ref-Casserley_3-0)** Casserley, H.C. (1960). *Historic locomotive pocket book*. London: Batsford. p. 51.

1. **[^](#cite_ref-4)** Baxter, (1977) pp.45 & 67.

1. **[^](#cite_ref-Baxter2b_5-0)** Baxter, Bertram (1979). *'British locomotive catalogue 1825-1923*. Vol. 2b. Buxton: Moorland Publishing. p. 196. [ISBN](/source/ISBN_(identifier)) [0-903485-84-2](https://en.wikipedia.org/wiki/Special:BookSources/0-903485-84-2).

1. **[^](#cite_ref-6)** Roland Arzul (15 December 2008). ["Les locomotives 220 type Nord de la Compagnie de l'Etat"](https://web.archive.org/web/20231002160605/http://roland.arzul.pagesperso-orange.fr/materiel/traction/220b.htm) (in French). Archived from [the original](http://roland.arzul.pagesperso-orange.fr/materiel/traction/220b.htm) on 2023-10-02. Retrieved 2 November 2023..

v t e Steam locomotive wheel arrangements (Whyte notation) Single engine types 0-2-2 0-2-4 2-2-0 2-2-2 2-2-4T 4-2-0 4-2-2 4-2-4T 6-2-0 0-3-0 (monorail) 0-4-0 0-4-0+4 0-4-2 0-4-4T 0-4-6T 2-4-0 2-4-2 2-4-4T 2-4-6T 4-4-0 4-4-2 4-4-4 4-4-6 0-6-0 0-6-2 0-6-4T 0-6-6T 2-6-0 2-6-2 2-6-4 2-6-6T 4-6-0 4-6-2 4-6-4 0-8-0 0-8-2 0-8-4T 0-8-6T 2-8-0 2-8-2 2-8-4 2-8-6 4-8-0 4-8-2 4-8-4 4-8-6 6-8-6 0-10-0 0-10-2 2-10-0 2-10-2 2-10-4 4-10-0 4-10-2 0-12-0 2-12-0 2-12-2 2-12-4T 4-12-2 4-14-4 Divided drive and duplex engine types 0-2-2-0 2-2-2-0 2-2-2-2 2-2-4-0T 4-2-2-0 2-4-6-2 4-4-4-4 6-4-4-6 4-4-6-4 4-6-4-4 Articulated locomotives Fairlie, Meyer and Garratt types 0-4-0+0-4-0 2-4-0+0-4-2 2-4-2+2-4-2 4-4-2+2-4-4 0-6-0+0-6-0 0-6-2+2-6-0 2-6-0+0-6-2 2-6-2+2-6-2 4-6-0+0-6-4 4-6-2+2-6-4 4-6-4+4-6-4 0-8-0+0-6-0T 2-8-0+0-8-2 2-8-2+2-8-2 4-8-0+0-8-4 4-8-2+2-8-4 4-8-4+4-8-4 Articulated locomotives Mallet types 0-4-4-0 0-4-4-2 2-4-4-0 2-4-4-2 0-6-6-0 2-6-6-0 2-6-6-2 2-6-6-4 2-6-6-6 2-6-8-0 4-4-6-2 4-6-6-2 4-6-6-4 0-8-8-0 2-8-8-0 2-8-8-2 2-8-8-4 4-8-8-2 4-8-8-4 2-10-10-2 Articulated locomotives Triplex and other multiplex types 2-8-8-8-2 2-8-8-8-4 2-8-8-8-8-2 0-6-2+2-4-2-4-2+2-6-0 2-6-6-2+2-6-6-2 2-8-8-8-8-8-2 2-10-10-10-10-10-2 2-4-4-2+2-8-8-2+2-4-4-2 Articulated locomotives Engerth types 0-4-4T 0-4-6T 2-6-4 0-6-4T 0-6-4-0 0-8-4T 0-8-6T Geared locomotives Shay Climax Heisler Willamette Other notation forms: AAR Swiss UIC

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Adapted from the Wikipedia article [2-2-2-0](https://en.wikipedia.org/wiki/2-2-2-0) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/2-2-2-0?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.