The Mb, later G12 class of Halmstad–Nässjö Järnväg (HNJ), known after nationalization in 1945 as the E9 class of the

Swedish State Railways The Swedish State Railways ( sv, Statens Järnvägar) or SJ, originally the Royal Railway Board ( sv, Kungl. Järnvägsstyrelsen), was the former government agency responsible for operating the state-owned railways in Sweden. It was created i ...

(SJ), was a type of steam locomotive built primarily for freight traffic. They were the basis for the nearly identical

SJ E10 The Swedish State Railways class E10 was a type of steam locomotive which was used for freight traffic. Ten locomotives were built in 1947 as a slightly modified version of the older E9 class. They were used mainly on the Inland Line, before bein ...

class.

History

Three Mb class three-cylinder

4-8-0 Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels on two axles, usually in a leading truck or bogie, eight powered and coupled driving wheels on four axles and no ...

locomotives were built by

NOHAB NOHAB (Nydqvist & Holm AB) was a manufacturing company based in the city of Trollhättan, Sweden. History The company was founded by Antenor Nydqvist, Johan Magnus Lidström and Carl Olof Holm in 1847 as ''Trollhättans Mekaniska Verkstad'' as ...

for HNJ in 1931, based on an older type, the 2-8-0 M class built in Germany in 1922. HNJ changed their type designations the year after, and the Mb class became the G12 class, where G meant that they were intended for freight trains (

Swedish Swedish or ' may refer to: Anything from or related to Sweden, a country in Northern Europe. Or, specifically: * Swedish language, a North Germanic language spoken primarily in Sweden and Finland ** Swedish alphabet, the official alphabet used by ...

: ''godståg''). Three more G12 class locomotives were built in 1936. Despite their designation the locomotives were also used in passenger trains. They remained on the HNJ network after nationalization in 1945, but were also used on

the line Line most often refers to: * Line (geometry), object with zero thickness and curvature that stretches to infinity * Telephone line, a single-user circuit on a telephone communication system Line, lines, The Line, or LINE may also refer to: Arts ...

between

Alvesta Alvesta () is a locality and the seat of Alvesta Municipality in Kronoberg County, Sweden, with 8,017 inhabitants in the urban area in 2010. Alvesta is an important railway junction, joining the Stockholm–Malmö–Copenhagen railway w ...

and

Borås Borås ( , , ) is a city (officially, a locality) and the seat of Borås Municipality, Västra Götaland County, Sweden. It had 66,273 inhabitants in 2010. Geography Borås is located at the point of two crossing railways, among them th ...

. SJ referred to the type as the E9 class. They were in service until 1959, and were then placed in reserve. They were scrapped between 1974 and 1976, and none have been preserved. In the 1940s the Swedish State Railways (SJ) saw a need for modern steam locomotives for freight traffic on the

Inland Line The Inland Line ( sv, Inlandsbanan) is a railway line between Kristinehamn and Gällivare in Sweden. It runs through the central parts of northern Sweden, and was built between 1908 and 1937. History There were several reasons for constructin ...

and in southern

Norrland Norrland (, "Northland", originally ''Norrlanden'' or "the Northlands") is the northernmost, largest and least populated of the three traditional lands of Sweden, consisting of nine provinces. Although Norrland does not serve any administ ...

. NOHAB built ten E10 class locomotives in 1947 from the same blueprints, but with some modifications. The E10 class locomotives were in use until the 1960s.

References

{{Swedish stock Steam locomotives of Sweden 4-8-0 locomotives Freight locomotives Standard gauge locomotives of Sweden