NSB Class 21

NSR 21 Class
Overview -
Propulsion:	Steam
Loco Type:	Tender Engine
Gauge:	4 ft 8 1/2 in
Manufacturing Details:
Builder:	Hamar Iron Foundry Thunes Mechanical Workshops NOHAB
Build Date:	1904 - 1919
Service:
Operator:	Norwegian State Railways
Years in Operation:	1904 - 1971
Total Produced:	42
Total Operational:	0
Total Scrapped:	37
Total Preserved:	5
Fleet No's:	146, 149–150, 174–183, 201–209, 224–225, 237, 251–253, 294–295, 312–315, 370–377
Disposition:	5 Preserved, Rest scrapped
Wheel Arrangement:
Whyte Notation:	2-6-0+T
UIC-Classification:	1'C
Axle No.	4
Boiler & Firebox:
Original Boiler Pressure:	12 kg/cm2
Grate Area:	1.26 m2
Heating Surface:	A: 78.1, B, C, D, E: 63.4 m2
Cylinders:
Cylinders (Dia. x Stroke):	A: 425 & 635, B, C, E: 432, D: 432 & 625 mm x 610 mm
Operation:
Water Capacity:	7.7 Tons
Coal Capacity:	3 Tons
Weight of Locomotive:	A & B: 33.5, C: 35.3, D: 36.9, E: 36.3 Tons
Total Weight:	A: 58.9, B: 59.1, C: 60.9, D: 61.9, E: 62.5 Tons
Weight of Tender(s):	11.9 Tons
Performance Statistics:
Maximum Speed:	60 km/h
Dimensions:
Total Length:	14, 432 mm
Valves & Motion:
Valve Gear:	Walschaerts

The Norwegian State Railways 21 (21a, 21b, 21c, 21d & 21e) Class are 2-6-0 tender steam locomotives.

History

The 21 (21a, 21b, 21c, 21d and 21e) class are a class of forty-two tender 2-6-0 locomotives. The class were first built in 1904 by the Hamar Iron Foundry then later by the Thunes Mechanical Workshop and last by NOHAB with the last being built in 1919. The 21 class was the most successful and numerous steam locomotive to be used by the Norwegian State Railways with five subclasses being produced. They were designed for small to medium sized goods and passenger trains essentially being general purpose mixed traffic locomotives.

21a

The 21a subclass were the successors to the 15c class but has a smaller wheelbase of up to 3 metres less then the 15c as well as a higher placement of the boiler among other modifications. These changes were made due to the tight curves in Bergen harbour and the overall Voss line. There were a total of 20 21a subclass locomotives built.

21b

This subclass were identical to the 21a class but were superheated this made the locomotives stronger and more fuel efficient. They were the first superheated locomotives on the Norwegian State Railways with a total of 14 locomotives constructed of the class.

21c

From the first world war a new type of technology called feed water preheaters had become popular and thus they were fitted to a total of eight locomotives constructed to this class which became a new designation of the 21 class due to the class gaining up to 2 tons with the preheaters fitted. The feed water preheaters reduced coal consumption but was quite complicated and difficult to utilize and also required a lot of maintenance. This rendered the preheaters uneconomic despite their fuel reducing capabilities. All of the class had the preheaters removed but retained their 21c designation.

21d

This class was a total of six locomotives converted from 21a that retained their compound machinery but were superheated. These conversions happened from 1923 to 1925 with all 21d locomotives being converted to 21e.

21e

Locomotives of 21d fitted with twin machinery and external influx changing the appearance of their cylinder arrangement slightly the conversion also improved the locomotives performance. Later on 3 21a class locomotives were also converted to 21e creating a total of 9 locomotives in the 21e class.

Preservation

Five of the 21 class have been preserved being No.252 and 225 from the 21b class, and No.376 and 377 from the 21c class, and 207 from the 21e class. Both 252 and 225 are stored awaiting overhauls while No.376 and 377 are both in the United Kingdom also awaiting overhauls with No.377 on display. No.207 is in storage in a warehouse owned by the Norwegian Railway Club awaiting restoration to operation.

List of Locomotives

Class list of locomotives of the 21 (21a, 21b, 21c, 21d and 21e) class.

Image:	No.	Name:	Built:	Builder:	Builder's No.	Status:
-	146	-	1909	Hamar Iron Foundry	38	Scrapped
-	149	-	1910	Thunes Mechanical Workshops	43	Scrapped
-	150	-	1910	Thunes Mechanical Workshops	44	Scrapped
Builder's photo of No.174.	174	-	1904	Thunes Mechanical Workshops	9	Scrapped
-	175	-	1904	Thunes Mechanical Workshops	10	Scrapped
Side view of No.176 in the 1910s.	176	-	1904	Thunes Mechanical Workshops	11	Scrapped
-	177	-	1904	Thunes Mechanical Workshops	12	Scrapped
-	178	-	1904	Thunes Mechanical Workshops	13	Scrapped
-	179	-	1906	Hamar Iron Foundry	15	Scrapped
-	180	-	1906	Hamar Iron Foundry	16	Scrapped
No.181 around 1910.	181	-	1906	Hamar Iron Foundry	17	Scrapped
-	182	-	1906	Thunes Mechanical Workshop	21	Scrapped
No.183 in 1952, Nesttun.	183	-	1906	Thunes Mechanical Workshop	22	Scrapped
-	201	-	1909	Thunes Mechanical Workshop	35	Scrapped
-	202	-	1909	Thunes Mechanical Workshop	36	Scrapped
-	203	-	1909	Thunes Mechanical Workshop	37	Scrapped
No.204 in an accident on the 2nd of August of 1910 in Sysle, Modum, Buskerud.	204	-	1909	Thunes Mechanical Workshop	38	Scrapped
-	205	-	1909	Thunes Mechanical Workshop	39	Scrapped
-	206	-	1909	Thunes Mechanical Workshop	40	Scrapped
No.207 in NSR service, Kongsberg, 1970.	207	-	1909	Hamar Iron Foundry	46	Preserved: Stored
-	208	-	1909	Hamar Iron Foundry	36	Scrapped
-	209	-	1909	Hamar Iron Foundry	37	Scrapped
-	224	-	1911	Thunes Mechanical Workshop	51	Scrapped
No.225 in 2010.	225	-	1911	Thunes Mechanical Workshop	52	Scrapped
-	237	-	1912	Hamar Iron Foundry	75	Scrapped
-	251	-	1912	Hamar Iron Foundry	81	Scrapped
No.252 in 1970.	252	-	1912	Hamar Iron Foundry	82	Preserved: Stored
-	253	-	1912	Hamar Iron Foundry	83	Scrapped
-	294	-	1916	Hamar Iron Foundry	109	Scrapped
-	295	-	1916	Hamar Iron Foundry	110	Scrapped
-	312		1919	Hamar Iron Foundry	126	Scrapped
-	313		1919	Hamar Iron Foundry	127	Scrapped
-	314		1919	Hamar Iron Foundry	128	Scrapped
-	315		1919	Hamar Iron Foundry	129	Scrapped
-	370	-	1919	NOHAB	1157	Scrapped
-	371	-	1919	NOHAB	1158	Scrapped
-	372	-	1919	NOHAB	1159	Scrapped
-	373	-	1919	NOHAB	1160	Scrapped
-	374	-	1919	NOHAB	1161	Scrapped
-	375	-	1919	NOHAB	1162	Scrapped
No.376 in 2016.	376	Norwegian	1919	NOHAB	1163	Preserved: Under Overhaul
No.377 in 2008.	377	King Haakon VII	1919	NOHAB	1164	Preserved: Display

Trivia

• It is the most well known NSR class.

Bibliography

Preserved Norwegian Steam Locomotives
Norwegian State Railways	III Class	No.21 'Alf'
	IV Class	No.10 'Hugin'
	XIII Class	No.7
	XXI Class	No.1 • No.2 • No.5
	XXVI Class	No.81
	XXII Class	No.6
	XXIX Class	No.5 'Bjørkelangen' • No.6 'Høland' • No.7 'Prydz'
	XXVII Class	No.2 'Urskog'
	XXVIII Class	No.4 'Setskogen'
	2a Class	No.16 • No.17 'Caroline'
	7a Class	No.11 • No.25
	18c Class	No.255
	21b Class	No.252 • No.225
	21c Class	No.376 • No.377
	21e Class	No.207
	23b Class	No.442 • No.443
	24b Class	No.236
	25a Class	No.227
	26c Class	No.411
	27a Class	No.234
	30a Class	No.271
	31b Class	No.452
	32a Class	No.288
	49c Class	No.470
	63a Class	No.2770
Industrial	Årdal Works	Årdal Works Tank Engine
	Bjarkøy Gruver	Bjarkøy Gruver Mines Tank Engine
	Sulitjelmabanen	No.1
	Norsk Hydro	Norsk Hydro Side Tank Engine • Norsk Hydro Fireless Tank Engine
	PapeterieDrammensalvens	PapeterieDrammensalvens Tank Engine
	Bjorkasen Mines	Bjorkasen Mines Tank Engine
	Luossavaara-Kirunavaara AB Iron-Ore	No.5
	MBV (SJ)	No.1432 • No.1155 'Mons Olsen'
	Kings Bay Coal Corporation	No.2
	Bjørnøen AS	No.1 'Pelle' • Bjørnøen AS Unnumbered Tank Engine