Uppsala-Gavle 4-6-0 Locomotives in Sweden

Class Ba/OKc (Locobase 20331)

Data from "Four-Cylinder Compound Locomotive for the Upsala-Gafle Ry-Sweden", Locomotive Magazine, Volume XX [20], No 259 (14 March 1914) , pp. 280-282. Works numbers were 1013-1014 in 1913.

The LM report noted in detail the reasons for resorting to a four-cylinder layout, which chiefly concerned stresses on components and better counterbalancing. In addition, compounding expansion improved fuel and water economy. So Nohab adopted a two-axle drive approach used by many French and German locomotives. The outside LP cylinders drove on the second axle while the inside HP cylinders powered the lead set of drivers.

The specification called for a train load of 352 tons in eleven bogie wagons up a 1% grade at 35 kph (21.7 mph) and an at-level maxmum speed of 90 kph (56 mph).

The pair remained in service on the UGJ until that railway was taken over by the Statens Jarnvagar in 1933. Although the SJ retained the eleven F-class four-cylinder compound Pacifics, it almost immediately disposed of the two OKc, probably because they were unique among Swedish locomotives in their compounding method and because impending electrification on the main lines would soon render steam express passenger engines redundant.

The 1515 was sold in 1935 to the Dalslandsbanan near the Norwegian border as their H3 type #12. The DB operated the lone engine for four years before scrapping it. The 1516 was scrapped in 1933.

Class Bb/OKb/B4 (Locobase 20409)

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 and Tommy Nilsson's Svenska-lok.se website at Svenska-lok.se, last accessed 21 June 2018. Works numbers were 1126-1127 in 1917 and 1765-1766 in 1926.

Locobase 20331 describes the pair of four-cylinder compound locomotives provided by Nohab to the UGJ in 1913. Four years later, the builder supplied two four-cylinder simple-expansion engines. Each cylinder was served by a 220 mm (8.66") piston valve. These were among the smallest Ten-wheelers driven by four simple-expansion cylinders

They apparently served the UGJ well enough for the railway to order two more nine years later.

But the Statens Jarnvagar, which took over the UGJ in 1933, didn't wait very long to convey the quartet to the Stockholm - VSsterss - Bergslagens (SWB) in 1934. Eleven years later, the SWB joined the SJ, which applied a B4 designation to the four engines.

(Using the narrower, fire-side tube and flue diameters of 44.5 mm and 122 mm, respectively, produced a tube heating surface of 124.3 sq m (1,338 sq ft) and a total estimated EHS of 135.75 sq m (1,461 sq ft).)