Danske Statsbaner 4-6-2 Locomotives in Denmark


Class Details by Steve Llanso of Sweat House Media

Class E (Locobase 2478)

[] . Works numbers were 1020 in 1914 and 10061-1070.

Repeats based on the original builder's drawings of the Swedish Class F Pacifics (Locobase 2477), 11 of which had been sold to Denmark in 1936. In Danish service, these engines had a tonnage rating of 650 tons on a 0.7% grade.


Class E (1) (Locobase 4031)

Data from William Bay, Danmarks Damplokomotiver (1977). works numbers were 314-319 in 1942-1943, 336-341 in 1944, 346-352 in 1947, and 413-418 in 1950.

A photo from Jens Vesterdahl's website ([]) shows a trim Pacific with sloping outside HP cylinders driving the second axle.


Class Pr (II) (Locobase 4033)

Data from William Bay, Danmarks Damplokomotiver (1977). See also Jernbane.dk at [], last accessed 2 June 2015.


Class Pr 904 (Locobase 4032)

Data from William Bay, Danmarks Damplokomotiver (1977). See also Jernbane.dk at [], last accessed 2 June 2015.

During its years under German control in World War Two, the DSB realized that they needed more adhesion in the locomotives pulling their expresses. And they knew they wouldn't be able to order new equipment. So Copenhagen shops retained the frame from the P-class 4-4-2s, used the firebox already installed in the H and R classes, trailing auxiliary axle from the O and S classes and created the Pacific shown here.

Tests of the 904 in 1943 were sufficiently encouraging that the railway went ahead and converted the 930. For the first few years, the conversion looked like a flop because the boilers didn't generate enough steam. Jernbane,dk reports that postwar studies showed simply that inexperienced stokers and poor coal starved the firebox of the calories it needed. As peace liberated Denmark, coal quality improved, and the stokers received better training, the class performed up to their promise.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassEE (1)Pr (II)Pr 904
Locobase ID2478 4031 4033 4032
RailroadDanske Statsbaner (DSB)Danske Statsbaner (DSB)Danske Statsbaner (DSB)Danske Statsbaner (DSB)
CountryDenmarkDenmarkDenmarkDenmark
Whyte4-6-24-6-24-6-24-6-2
Number in Class113577
Road Numbers964-974975-999PR 901, 904, 905, 908, 921, 926, 930901, 904-905, 908, 921, 926, 930
GaugeStdStdStdStd
Number Built11357
BuilderNydqvist & Holm (NOHAB)FrichsDSBDSB
Year1917191419441943
Valve GearWalschaertHeusingerHeusinger
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.96 / 3.9512.96 / 3.95 3.95 / 3.9515.42 / 4.70
Engine Wheelbase (ft / m)36.42 / 11.1036.42 / 11.10 7.90 / 11.1028.54 / 8.70
Ratio of driving wheelbase to overall engine wheelbase 0.36 0.36 0.50 0.54
Overall Wheelbase (engine & tender) (ft / m)59.71 / 18.2059.71 / 18.20 / 18.2054.79 / 16.70
Axle Loading (Maximum Weight per Axle) (lbs / kg)39,683 / 18,000
Weight on Drivers (lbs / kg)119,049 / 54,000119,049 / 54,000107,520 / 48,770107,519 / 48,770
Engine Weight (lbs / kg)188,936 / 85,700194,888 / 88,400176,064 / 79,861173,823 / 78,845
Tender Loaded Weight (lbs / kg)123,459 / 56,000121,695 / 55,200107,520 / 48,770114,640 / 52,000
Total Engine and Tender Weight (lbs / kg)312,395 / 141,700316,583 / 143,600283,584 / 128,631288,463 / 130,845
Tender Water Capacity (gals / ML)6600 / 256758 / 25.606072 / 23
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 7.20 / 7 7.20 / 7 6.70 / 6 6.60 / 6
Minimum weight of rail (calculated) (lb/yd / kg/m)66 / 3366 / 3360 / 3060 / 30
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)74 / 188074.60 / 189568.10 / 173068.10 / 1730
Boiler Pressure (psi / kPa)188.50 / 13188.50 / 13188.50 / 13188.50 / 13
High Pressure Cylinders (dia x stroke) (in / mm)16.54" x 25.98" / 420x66016.54" x 25.98" / 420x66014.17" x 25.2" / 360x64013.39" x 23.62" / 340x600
Low Pressure Cylinders (dia x stroke) (in / mm)24.8" x 25.98" / 630x66025" x 25.98" / 635x66024" x 25" / 610x63522.44" x 24.02" / 570x610
Tractive Effort (lbs / kg)21,302 / 9662.4421,235 / 9632.0517,619 / 7991.8514,760 / 6695.03
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.59 5.61 6.10 7.28
Heating Ability
Tubes (number - dia) (in / mm)154 - 2.047" / 52
Flues (number - dia) (in / mm)28 - 5.157" / 131
Flue/Tube length (ft / m)17.39 / 5.3017.39 / 5.3015.62 / 4.76
Firebox Area (sq ft / m2)132.35 / 12.30134.28 / 12.48182.92 / 17
Grate Area (sq ft / m2)38.74 / 3.6038.74 / 3.6027.98 / 2.6028.19 / 2.62
Evaporative Heating Surface (sq ft / m2)2037 / 189.302041 / 189.681663 / 154.551603 / 149
Superheating Surface (sq ft / m2)732 / 68.03685 / 63.64527 / 49495 / 46
Combined Heating Surface (sq ft / m2)2769 / 257.332726 / 253.322190 / 203.552098 / 195
Evaporative Heating Surface/Cylinder Volume315.29315.91361.56416.41
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7302730252745314
Same as above plus superheater percentage9201912865406589
Same as above but substitute firebox area for grate area31,43431,64042,756
Power L114,86414,09613,568
Power MT825.78783.11834.61

All material Copyright © SteamLocomotive.com
Wes Barris