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Specifications
Specifications
Configuration:;
• Whyte	4-8-0
• UIC	2′D h3
Gauge	1,435 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)
Length	18,000 mm (59 ft 1 in)
Loco weight	73.5 tonnes (72.3 long tons; 81.0 short tons)
Total weight	111.5 tonnes (109.7 long tons; 122.9 short tons)
Fuel type	Coal
Fuel capacity	5.0 tonnes (4.9 long tons; 5.5 short tons)
Water cap.	15.0 m3 (3,300 imp gal; 4,000 US gal)
Cylinders	Three

Type and origin
Type and origin
Power type	Steam
Builder	NOHAB
Build date	1931–1936

HNJ Mb
HNJ Mb
	G12 no:43 leaving Halmstad Station in 1931
Power type
Type and origin
Power type	Steam
Builder	NOHAB
Build date	1931–1936
Configuration:;
Specifications
Configuration:;
• Whyte	4-8-0
• UIC	2′D h3
Gauge	1,435 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)
Length	18,000 mm (59 ft 1 in)
Loco weight	73.5 tonnes (72.3 long tons; 81.0 short tons)
Total weight	111.5 tonnes (109.7 long tons; 122.9 short tons)
Fuel type	Coal
Fuel capacity	5.0 tonnes (4.9 long tons; 5.5 short tons)
Water cap.	15.0 m3 (3,300 imp gal; 4,000 US gal)
Cylinders	Three
Maximum speed
Performance figures
Maximum speed	70 km/h (43 mph)
Tractive effort	12.1 Mp (119 kN; 27,000 lbf)
Operators
Career
Operators	Halmstad–Nässjö Järnväg; Statens Järnvägar;
Number in class	6
Disposition	Scrapped
	References:

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.

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

^ ^a ^b ^c ^d ^e ^f Diehl, Ulf; Fjeld, Ulf; Nilsson, Lennart (1973). Normalspåriga ånglok vid Statens Järnvägar (in Swedish). Svenska Järnvägsklubben. pp. 72–73. ISBN 91-85098-13-2.
^ ^a ^b ^c 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.
^ ^a ^b ^c ^d Karlsson, Lars Olov (2008). SJ:s ånglok (in Swedish). Frank Stenvalls Förlag. p. 93. ISBN 978-91-7266-171-4.