# 0-12-0

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Locomotive wheel arrangement

Under the [Whyte notation](/source/Whyte_notation) for the classification of [steam locomotives](/source/Steam_locomotive), **0-12-0** represents the [wheel arrangement](/source/Wheel_arrangement) of no [leading wheels](/source/Leading_wheel), twelve powered and coupled [driving wheels](/source/Driving_wheel) on six axles, and no [trailing wheels](/source/Trailing_wheel).

## Equivalent classifications

Other equivalent classifications are:

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

- [French classification](/source/French_classification): **060**

- [Turkish classification](/source/Turkish_classification): **66**

- [Swiss classification](/source/Swiss_classification): **6/6**

*Pennsylvania*

The first example of the 0-12-0 was the *Pennsylvania*, designed by Jame Milholland for the [Philadelphia and Reading Railroad](/source/Philadelphia_and_Reading_Railroad) and built at its own shops in 1863. It weighed fifty tons and was, at the time, the heaviest steam locomotive in the world.[1] It was intended as a [pusher engine](/source/Bank_engine) for Pennsylvania coal trains on the Falls Grades near [Philadelphia](/source/Philadelphia).[2]

## Tank engines

There were only two classes of 0-12-0T locomotives:

The first was a class of three rack locomotives built by [Lokomotivfabrik Floridsdorf](/source/Lokomotivfabrik_Floridsdorf) in 1912 for use on the [Erzberg Railway](https://en.wikipedia.org/w/index.php?title=Erzberg_Railway&action=edit&redlink=1) (*Erzbergbahn*) in Austria. Initially classified as **[class 269](/source/KkStB_269)** by the [kkStB](/source/KkStB), they passed to the BBÖ after World War I, the [Deutsche Reichsbahn](/source/Deutsche_Reichsbahn) in 1939, and finally the [ÖBB](/source/%C3%96BB) after World War II. They all stayed in service until the 1970s.

The only others of the type, was a class of ten 0-12-0T locomotives built by [Hanomag](/source/Hanomag) in 1922 for the [Bulgarian State Railways](/source/Bulgarian_State_Railways) (BDŽ). They were initially numbered [4001–4010](https://en.wikipedia.org/w/index.php?title=BD%C5%BD_4000_series&action=edit&redlink=1), but were renumbered 45.01 to 45.10 in 1935–1936.[3] They were built as two-cylinder compound locomotives, with a 15-kilogram-per-square-centimetre (1.47 MPa; 213 psi) boiler feeding a 620-by-700-millimetre (24.41 in × 27.56 in) high-pressure cylinder discharging to a 900-by-700-millimetre (35.43 in × 27.56 in), both of which were connected to the 1,340-millimetre (52.76 in) driving wheels. The locomotives weighed 101 tonnes (99 long tons; 111 short tons).[4]

## References

Wikimedia Commons has media related to [0-12-0 locomotives](https://commons.wikimedia.org/wiki/Category:0-12-0_locomotives).

1. **[^](#cite_ref-FOOTNOTEWhite197228_1-0)** [White 1972](#CITEREFWhite1972), p. 28.

1. **[^](#cite_ref-FOOTNOTEEllis196880_2-0)** [Ellis 1968](#CITEREFEllis1968), p. 80.

1. **[^](#cite_ref-FOOTNOTEDurrant197264–65_3-0)** [Durrant 1972](#CITEREFDurrant1972), pp. 64–65.

1. **[^](#cite_ref-FOOTNOTEDurrant197271_4-0)** [Durrant 1972](#CITEREFDurrant1972), p. 71.

## Bibliography

- Durrant, A. E. (1972). *The Steam Locomotives of Eastern Europe*. Newton Abbot, Devon: David and Charles. [ISBN](/source/ISBN_(identifier)) [0-7153-4077-8](https://en.wikipedia.org/wiki/Special:BookSources/0-7153-4077-8).

- [Ellis, C. Hamilton](/source/C._Hamilton_Ellis) (1968). *Pictorial encyclopaedia of railways*. London: Hamlyn. [ISBN](/source/ISBN_(identifier)) [0-600-37585-4](https://en.wikipedia.org/wiki/Special:BookSources/0-600-37585-4).

- White, John H. Jr. (1972). [*Early Locomotives*](https://archive.org/details/earlyamericanloc00whit). New York: Dover. [ISBN](/source/ISBN_(identifier)) [0-486-22772-3](https://en.wikipedia.org/wiki/Special:BookSources/0-486-22772-3).

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 [0-12-0](https://en.wikipedia.org/wiki/0-12-0) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/0-12-0?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.