# 2-4-4T

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/2-4-4T
> Markdown URL: https://mediated.wiki/source/2-4-4T.md
> Source: https://en.wikipedia.org/wiki/2-4-4T
> Source revision: 1313534978
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

Tank locomotive wheel arrangement

This article needs more citations. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "2-4-4T" – news · newspapers · books · scholar · JSTOR (December 2009) (Learn how and when to remove this message)

Diagramatic representation of 2-4-4. Front of engine to the left.

2-4-4 [Mason Bogie locomotive](/source/Mason_Bogie_locomotive) #6 on the [Boston, Revere Beach and Lynn Railroad](/source/Boston%2C_Revere_Beach_and_Lynn_Railroad) as built in 1886.

[Lithuanian Tk](/source/OKf100)

Under the [Whyte notation](/source/Whyte_notation) for the classification of steam locomotives by wheel arrangement, 2-4-4 is a [steam locomotive](/source/Steam_locomotive) with two unpowered [leading wheels](/source/Leading_wheel) followed by four powered [driving wheels](/source/Driving_wheel) and four unpowered [trailing wheels](/source/Trailing_wheel). This configuration was only used for [tank locomotives](/source/Tank_locomotive).

## Equivalent classifications

Other equivalent classifications are:

- [UIC classification](/source/UIC_classification): **1B2** (also known as German classification and [Italian classification](/source/Italian_classification))

- [French classification](/source/French_classification): **122**

- [Turkish classification](/source/Turkish_classification): **25**

- [Swiss classification](/source/Swiss_classification): **2/5**

The equivalent [UIC classification](/source/UIC_classification) is **1′B2′ t** (or **(1′B)2′ t** for a Mason Bogie).

## Examples

This unusual wheel arrangement does not appear to have been used on the [mainline](/source/Main_line_(railway)) railways in the UK. It was however one of the configurations used on the [Mason Bogie](/source/Mason_Bogie_locomotive) [articulated locomotives](/source/Articulated_locomotive), in the USA during the 1870s and 1880s. Five examples were constructed at the [Mason Machine Works](/source/Mason_Machine_Works) for the [narrow gauge](/source/Narrow_gauge) [Boston, Revere Beach and Lynn Railroad](/source/Boston%2C_Revere_Beach_and_Lynn_Railroad) 1883–1887. The railway subsequently received twenty-one further examples between 1900 and 1914, constructed by the [Taunton Locomotive Manufacturing Company](/source/Taunton_Locomotive_Manufacturing_Company), [Manchester Locomotive Works](/source/Manchester_Locomotive_Works), and [ALCO](/source/ALCO). Developmentally, there are two logical ways of reaching this wheel formula: to add a forward axle to a Forney locomotive to improve its ability to negotiate curves, or to add a second trailing axle to a Columbia design, notably in a 2-4-4(T) configuration to expand its coal capacity.

Four 2-4-4T passenger locomotives were built by the Czechoslovak Škoda for Lithuania in 1932 and marked as Tk class. They were seized by the USSR in 1940, then by the Germans.[1] One was used after World War II in Poland as [OKf100-1](/source/OKf100) until 1950.[2]

Other tank locomotives with 2-4-4T arrangement:

- [Bavarian D XII](/source/Bavarian_D_XII)

- French T5 6601 - 6637 of AL railway

## References

1. **[^](#cite_ref-1)** Vitaliy A. Rakov, *Lokomotivy otechestvennyh zheleznyh dorog 1845-1955*, Moscow 1995, [ISBN](/source/ISBN_(identifier)) [5-277-00821-7](https://en.wikipedia.org/wiki/Special:BookSources/5-277-00821-7) (n Russian), p.333

1. **[^](#cite_ref-2)** Paweł Terczyński, *Atlas parowozów*, Poznań, 2003, [ISBN](/source/ISBN_(identifier)) [83-901902-8-1](https://en.wikipedia.org/wiki/Special:BookSources/83-901902-8-1), p. 94

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

---
Adapted from the Wikipedia article [2-4-4T](https://en.wikipedia.org/wiki/2-4-4T) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/2-4-4T?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.