The reference for locomotives and railcars


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Danish State Railways R (I)
Denmark | 1912 | 20 produced
Die Lokomotive, March 1913

After the passenger trains on the main routes on Jutland and Funen had reached a weight of 800 tonnes, the pulling power of the Litra P (II) Atlantic locomotives reached their limits. In view of the good experiences with the Prussian P 8, a new locomotive with the wheel arrangement 4-6-0 was developed with the R (I) and ordered from Borsig.

At 1,866 mm, the coupled wheels had a slightly smaller diameter than those of the P (II). The saturated four-cylinder compound engine now received a successor in a simple superheated two-cylinder engine. By relocating the cylinders to the middle of the bogie and driving the first axle, smooth running could be maintained at a high level. The boiler had roughly the same dimensions and was able to produce the same output despite the boiler pressure being reduced from 15 to 12 bars. The narrow and deep firebox was designed for high quality British coal and compensated the smaller grate area with a larger area of the walls.

R 935, probably on a Borsig works photo
R 935, probably on a Borsig works photo

After the first twelve vehicles, a further eight were to be procured by Borsig, but this was not possible due to the First World War. Instead, the Swiss locomotive factory in Winterthur delivered the remaining machines. These had a steel firebox, which was replaced with a copper one after the war. The locomotives were eventually retired between 1958 and 1972. An example damaged in an accident was restored and then came to Danmarks Jernbanemuseum in Odense. Unfortunately, it was scrapped in 2018 along with about half of the museum's exhibits.

Axle config4-6-0 (Ten-wheeler) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length62 ft 10 5/16 in62 ft 10 1/2 in
Wheelbase29 ft 8 5/16 in
Fixed wheelbase15 ft 1 1/8 in
Total wheelbase53 ft 7 11/16 in
Empty weight136,686 lbs141,096 lbs
Service weight152,119 lbs156,799 lbs
Adhesive weight105,822 lbs110,209 lbs
Total weight260,145 lbs267,030 lbs
Axle load35,274 lbs36,736 lbs
Water capacity5,548 us gal
Fuel capacity13,228 lbs (coal)
Power sourcesteam
Estimated power1,207 hp (900 kW)1,194 hp (890 kW)
Optimal speed29 mph28 mph
Top speed62 mph
Starting effort26,743 lbf
Power Plant
Driver diameter73.5 in
Boiler pressure174 psi
Expansion typesimple
Cylinderstwo, 22 7/16 x 26 3/8 in
Grate area28.2 sq ft
Firebox area188.4 sq ft183 sq ft
Tube heating area1,671.6 sq ft1,519.9 sq ft
Evaporative heating area1,860 sq ft1,702.8 sq ft
Superheater area475.8 sq ft514.5 sq ft
Total heating area2,335.8 sq ft2,217.4 sq ft
Calculated Values
steam locomotive
last changed: 05/2022

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