NSB Class XXI

NSB locomotive class XXI number 1 photographed at Dübs & Co. Locomotive Works before delivery to the Setesdal Line.
Photograph by Dübs & Co., 1894.

Type and origin
Power type	Steam
Builder	Dübs & Co. (2) Thunes Mekaniske Værksted (1), Hamar Jernstøberi (1)
Serial number	Dübs 3172–3173, Thune 4, Hamar 77
Build date	1894 (2), 1901 (1) 1912 (1)
Total produced	4

Specifications
Configuration:
• Whyte	2-6-2T
• UIC	1′C1′t n2
Gauge	1,067 mm (3 ft 6 in)
Driver dia.	914 mm (36.0 in)
Minimum curve	100 m (330 ft)
Length	8,300 mm (27.2 ft)
Adhesive weight	14.7 t
Loco weight	18.7 t
Fuel type	Coal
Fuel capacity	800 kg (1,800 lb)
Water cap.	2.1 t
Firebox:
• Grate area	0.7 m² (7.5 sq ft)
Boiler pressure	1.00 MPa (145 psi)
Heating surface	37.87 m² (407.6 sq ft)
Cylinders	Two, outside
Cylinder size	279.4 mm ×ばつ 457.2 mm (11 in ×ばつ 18 in) or 292.1 mm ×ばつ 457.2 mm (11.5 in ×ばつ 18 in)
Loco brake	Hand brake, Carpenter brake from 1900

Performance figures
Maximum speed	40 km/h (25 mph)

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Find sources: "NSB Class XXI" – news · newspapers · books · scholar · JSTOR (February 2024)

NSB Class XXI is a steam locomotive class designed by the Norwegian State Railways exclusively for use on the Setesdal Line.^[1]