Halmstad-Nassjo 2-6-0 Locomotives in Sweden


Class Details by Steve Llanso of Sweat House Media

Class P6/L27 (Locobase 20798)

Data from Litt. L27, one of a series of SJ locomotive diagrams archived by Anders Lundbing on [link], last accessed 10 June 2017 (Snabcon AB advertised its tools for mounting RJ45 connectors on bundled cables.); and Tommy Nilsson's Svenska-lok.se website at Svenska-lok.se, last accessed 21 June 2018.

Aktiebolaget Atlas, Stockholm had delivered Moguls to the HNJ in the 1890s and 1904 (Locobase ). By the time these two Moguls were ordered in 1909, the railway wanted to see what superheating would contribute to engine power and efficiency. So the pair were equipped with Cole superheaters and 180 mm (7.09") diameter piston valves. (Cole superheaters were designed by Alco's Schenectady works and are thought of as a variant of the definitive Schmidt firetube system.)

Tommy Nilsson remarked (in translation) that the 27-28 were "strong, fast locomotives for passenger and express trains."

They served the HNJ and the nationalized Statens Jarnvagar (after 1945) until they were struck in 1957. 1767 was scrapped in the same year while 1768 was kept for emergencies for a couple of years. It was scrapped in 1959.


Class P6/L28 (Locobase 20795)

Data from Litt. L28, one of a series of SJ locomotive diagrams archived by Anders Lundbing on [link], last accessed 10 June 2017 (Snabcon AB advertised its tools for mounting RJ45 connectors on bundled cables.); and Tommy Nilsson's Svenska-lok.se website at Svenska-lok.se, last accessed 21 June 2018.

Aktiebolaget Atlas, Stockholm delivered six Moguls in 1894 with external cylinders and 1,400 mm (55.1 in) driver diameters. These were E6a; the 1904 E6b had larger cylinders. Nilsson doesn't specify which locomotives received the superheaters shown in the specifications in 1915-1918.

HNJ sold the 15 to the Msl - +rjSngs JSrnvSg before the rest of the class was superheated. The AmAJ reorganized in 1933 as the Dalslandsbanan. The four 1904 locomotives and the DJ 15 were incorporated into the Statens Jarnvagar in 1945 and placed together in class L28. 1769-1770 and 1772 were retired in 1952. 1770 and 1772 scrapped in 1953 at Vislanda. 1771, which was retired in 1953 was scrapped in 1953. 1771 and 1865 were scrapped in 1955, and class leader met its maker in 1956.


Class P6b/L26 (Locobase 20794)

Data from Litt-L26, one of a series of SJ locomotive diagrams archived by Anders Lundbing on [link], last accessed 10 June 2017. See also the Bergslagen Railway Society's page at , last accessed 2 June 2015. Works numbers were 608, 666 in 1902 and 1948, 1944 in 1931.

NOHAB delivered this pair of Moguls in 1902 with saturated boilers. Nilsson (in translation) noted that they followed soon after the OSJ locomotives (later SJ L21) described in 20405

It wasn't long before 18 (in 1913) and 17 (in 1916) received superheaters. About fifteen years later, Trolhattan (home of NOHAB) conducted what Nilsson (in translation) called a "radical rebuild" that included a new and repositioned boiler, new cab, and rebuilt tender.

The Statens Jarnvagar took over the pair in 1945, classified them L26, and renumbered them 1765-1766. They carried on at Falkoping-Landeryd until their retirement in the mid-1950s. Scrapping soon followed for 1766 in 1957 with 1765 being broken up in 1759.

Principal Dimensions by Steve Llanso of Middle Run Media
ClassP6/L27P6/L28P6b/L26
Locobase ID20798 20795 20794
RailroadHalmstad-Nassjo (HNJ)/Statens Jarnvagar (SJ)Halmstad-Nassjo (HNJ)/Statens Jarnvagar (SJ)Halmstad-Nassjo (HNJ)/Statens Jarnvagar (SJ)
CountrySwedenSwedenSweden
Whyte2-6-02-6-02-6-0
Number in Class222
Road Numbers27-28/1767-176811-16, 29-32/1769-1772, 186517-18/1765-1766
GaugeStdStdStd
Number Built
BuilderHNJHNJHNJ
Year190919151931
Valve GearWalschaertWalschaertStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.12 / 411.15 / 3.4016.24 / 4.95
Engine Wheelbase (ft / m)20.18 / 6.1518.37 / 5.6028.22 / 8.60
Ratio of driving wheelbase to overall engine wheelbase 0.65 0.61 0.58
Overall Wheelbase (engine & tender) (ft / m)36.91 / 11.2536.17 / 11.0347.57 / 14.50
Axle Loading (Maximum Weight per Axle) (lbs / kg)23,534 / 10,67523,810 / 10,80025,574 / 11,600
Weight on Drivers (lbs / kg)68,509 / 31,07568,123 / 30,90076,247 / 34,585
Engine Weight (lbs / kg)82,398 / 37,37583,886 / 38,05094,699 / 42,955
Tender Loaded Weight (lbs / kg)65,257 / 29,60057,541 / 26,10068,453 / 31,050
Total Engine and Tender Weight (lbs / kg)147,655 / 66,975141,427 / 64,150163,152 / 74,005
Tender Water Capacity (gals / ML)3221 / 12.203221 / 12.202904 / 11
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 4.40 / 4 4.40 / 4 5.50 / 5
Minimum weight of rail (calculated) (lb/yd / kg/m)38 / 1938 / 1942 / 21
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)61 / 155056.70 / 144061 / 1549
Boiler Pressure (psi / kPa)156.60 / 1080156.60 / 1080184.20 / 1270
High Pressure Cylinders (dia x stroke) (in / mm)17.72" x 24.02" / 450x61017.72" x 24.02" / 450x61017.32" x 24.02" / 440x610 (3)
Tractive Effort (lbs / kg)16,458 / 7465.2317,706 / 8031.3227,742 / 12583.57
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.16 3.85 2.75
Heating Ability
Tubes (number - dia) (in / mm)101 - 1.89" / 4895 - 1.89" / 48118 - 1.732" / 44
Flues (number - dia) (in / mm)15 - 5" / 12715 - 5" / 12718 - 5.197" / 132
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)69.97 / 6.5074.27 / 6.9086.11 / 8
Grate Area (sq ft / m2)15.18 / 1.4115.61 / 1.4516.47 / 1.53
Evaporative Heating Surface (sq ft / m2)734 / 68.20694 / 64.50799 / 74.23
Superheating Surface (sq ft / m2)215 / 20202 / 18.80245 / 22.76
Combined Heating Surface (sq ft / m2)949 / 88.20896 / 83.301044 / 96.99
Evaporative Heating Surface/Cylinder Volume107.06101.2281.32
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation237724453034
Same as above plus superheater percentage292430073732
Same as above but substitute firebox area for grate area13,47714,30619,510
Power L1701062246546
Power MT676.75604.27567.82

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