Statens Jarnvagar 0-10-0 Locomotives in Sweden

Class R (Locobase 8943)

Data from Litt R one of a series of SJ locomotive diagrams archived by Anders Lundbing on [], last accessed 10 June 2017 (Snabcon AB advertised its tools for mounting RJ45 connectors on bundled cables.) and Olavia Hokas's Swedish Steam website at [], first accessed 21 January 2006 (most recently 29 April 2018). See also Albert H Bone, "Some Recent Designs of Locomotives for Service on Continental Railways", Cassier's Magazine, Volume XXXVII [37], No 5 (March 1910) pp. 561-609. Motala supplied two in 1908 and Nohab added three in 1909.

When the Norwegian State Railways beefed up its ability to move ore trains from RiksgrSnsen to Narvik, it eclipsed the pulling power of the SJ's Ma class on the rival line from RiksgrSnsen to Kiruna in Sweden. So the SJ ordered five of its most powerful locomotives. Running at 4.5% cutoff, one engine could pull 1,430 tons up a 1% grade, thus replacing two eight-coupled engines. Bar frames measuring 110 mm in diameter (4.33") were made in two sections and bolted together between the third and fourth axles. The fixed wheelbase was 2.9 m (9 ft 6 3/16").

Its "oversquare" (bore greater than stroke) cylinders and driver diameter meant pulling power and doubtless did the job, but the Swedish line was soon electrified. Relocated to the Norra Stambanan, the class served the SJ until 1935, when they were sold to the GSvle - Dala. Used once again by the SJ in 1961-1962 to haul the Kalvik train from RSttvik southeast to Falun (and thence to Kalvik on the Skaggerak just south of Oslo).

974 never returned to the SJ, 975 was traded to the Danish State Railways in exchange for one of the F-class Pacifics, but was soon scrapped. The others remained on the books until 1973.