The reference for locomotives and railcars


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Dunderland Iron Ore Company No. A3 and A4
Norwegian State Railways type 54a
Norway | 1902 | 2 produced
A4 on a factory photo
A4 on a factory photo

Four tank locomotives were ordered for the opening of the Dunderlandsbane by the British mining company DIOC, of which the two larger ones came from Kerr, Stuart & Co. They had the wheel arrangement 2-6-2T and were adapted to the climate in Norway with a closed cab. When the Dunderlandsbane was integrated into the NSB network in 1947, these locomotives were also taken over. They now became the Type 54a, the last of which was in service until 1957.

ManufacturerKerr, Stuart & Co.
Axle config2-6-2T (Prairie) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length32 ft 11 11/16 in
Wheelbase22 ft
Empty weight78,264 lbs
Service weight110,231 lbs
Adhesive weight85,980 lbs
Axle load28,660 lbs
Water capacity1,958 us gal
Fuel capacitycoal
Power sourcesteam
Estimated power325 hp (242 kW)
Optimal speed12 mph
Top speed25 mph
Starting effort17,854 lbf
Power Plant
Driver diameter39 in
Boiler pressure160 psi
Expansion typesimple
Cylinderstwo, 16 x 20 in
Grate area15.5 sq ft
Evaporative heating area853.5 sq ft
Total heating area853.5 sq ft
Calculated Values
steam locomotive
tank locomotive
last changed: 04/2023

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