HNJ Mb

The Mb, later G12 class of Halmstad–Nässjö Järnväg (HNJ), known after nationalization in 1945 as the E9 class of the Swedish State Railways (SJ), was a type of steam locomotive built primarily for freight traffic. They were the basis for the nearly identical SJ E10 class.

HNJ Mb
G12 no:43 leaving Halmstad Station in 1931
Type and origin
Power typeSteam
BuilderNOHAB
Build date1931–1936
Specifications
Configuration:
​
 • Whyte4-8-0
 • UIC2′D h3
Gauge1,435 mm (4 ft 8+1⁄2 in) standard gauge
Leading dia.900 mm (2 ft 11 in)
Driver dia.1,400 mm (4 ft 7 in)
Length18,000 mm (59 ft 1 in)
Loco weight73.5 tonnes (72.3 long tons; 81.0 short tons)
Total weight111.5 tonnes (109.7 long tons; 122.9 short tons)
Fuel typeCoal
Fuel capacity5.0 tonnes (4.9 long tons; 5.5 short tons)
Water cap.15.0 m3 (3,300 imp gal; 4,000 US gal)
CylindersThree
Performance figures
Maximum speed70 km/h (43 mph)
Tractive effort12.1 Mp (119 kN; 27,000 lbf)
Career
Operators
Number in class6
DispositionScrapped
References:[1]

History

Three Mb class three-cylinder 4-8-0 locomotives were built by NOHAB for HNJ in 1931, based on an older type, the 2-8-0 M class built in Germany in 1922.[1][2] 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: godståg).[2] Three more G12 class locomotives were built in 1936.[1]

Despite their designation the locomotives were also used in passenger trains.[3] They remained on the HNJ network after nationalization in 1945, but were also used on the line between Alvesta and Borås.[1] SJ referred to the type as the E9 class.[3] They were in service until 1959, and were then placed in reserve.[1] They were scrapped between 1974 and 1976, and none have been preserved.[2]

In the 1940s the Swedish State Railways (SJ) saw a need for modern steam locomotives for freight traffic on the Inland Line and in southern Norrland.[3] NOHAB built ten E10 class locomotives in 1947 from the same blueprints, but with some modifications.[1] The E10 class locomotives were in use until the 1960s.[3]

References
  1. Diehl, Ulf; Fjeld, Ulf; Nilsson, Lennart (1973). Normalspåriga ånglok vid Statens Järnvägar (in Swedish). Svenska Järnvägsklubben. pp. 72–73. ISBN 91-85098-13-2.
  2. Karlsson, Lars Olov (2012). Ånglok vid Sveriges normalspåriga enskilda järnvägar. Del 1. BJ–LyJ (in Swedish). Malmö: Frank Stenvalls Förlag. pp. 128–131. ISBN 978-91-7266-182-0.
  3. Karlsson, Lars Olov (2008). SJ:s ånglok (in Swedish). Frank Stenvalls Förlag. p. 93. ISBN 978-91-7266-171-4.
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