South African Class NG2 0-4-2ST

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South African Class NG2 0-4-2ST - Wikipedia

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South African Class NG2 0-4-2ST

Class NG2 with a saddle-tank, as built

Type and origin
Power type	Steam
Designer	Dickson Manufacturing Company
Builder	Dickson Manufacturing Company
Serial number	978 & 1019
Build date	1897 & 1898
Total produced	2
Rebuilder	South African Railways
Number rebuilt	2 to 0-4-2 tender

Specifications
Configuration:
• Whyte	0-4-2 ST
• UIC	B1n2t as built B1n2 modified
Driver	2nd coupled axle
Gauge	600 mm (1 ft 11+5⁄8 in) narrow
Coupled dia.	24+1⁄2 in (622 mm)
Trailing dia.	20+1⁄2 in (521 mm)
Wheelbase	10 ft 4+1⁄2 in (3,162 mm)
• Coupled	4 ft (1,219 mm)
Length:
• Over couplers	18 ft 10 in (5,740 mm)
• Over beams	17 ft 1 in (5,207 mm)
Width	6 ft 3+1⁄2 in (1,918 mm)
Height	8 ft 7 in (2,616 mm) over cab 8 ft 5 in (2,565 mm) over chimney
Frame type	Bar
Axle load	4 LT (4,064 kg)
• 1st coupled	4 LT (4,064 kg)
• 2nd coupled	4 LT (4,064 kg)
• Trailing	3 LT (3,048 kg)
Adhesive weight	8 LT (8,128 kg)
Loco weight	11 LT (11,180 kg)
Fuel type	Coal
Fuel capacity	2,150 lb (975 kg)
Water cap.	200 imp gal (909 L) as built
Firebox:
• Type	Round-top
• Grate area	5.83 sq ft (0.542 m²)
Boiler:
• Pitch	3 ft 8+1⁄4 in (1,124 mm)
• Diameter	2 ft 2+7⁄8 in (683 mm)
• Tube plates	6 ft 8+1⁄2 in (2,045 mm)
• Small tubes	60: 1+1⁄2 in (38 mm)
Boiler pressure	130 psi (896 kPa)
Safety valve	Ramsbottom (reboilered)
Heating surface:
• Firebox	33 sq ft (3.1 m²)
• Tubes	158 sq ft (14.7 m²)
• Total surface	191 sq ft (17.7 m²)
Cylinders	Two
Cylinder size	7 in (178 mm) bore 10 in (254 mm) stroke
Valve gear	Stephenson
Valve type	Slide
Couplers	Buffers-and-chain

Performance figures
Power output	106 hp (79 kW)
Tractive effort	1,950 lbf (8.7 kN) @ 75%

Career
Operators	Rand Mines Limited South African Railways
Class	Class NG2
Number in class	2
Numbers	NG93-NG94
Delivered	1897 & 1898
First run	1897
Withdrawn	1936

The South African Railways Class NG2 0-4-2ST of 1897 was a narrow-gauge steam locomotive from the pre-Union era in Transvaal.

Between 1897 and 1901, Arthur Koppel, acting as agent, imported a number of Dickson-built 0-4-2 ST narrow-gauge steam locomotives for mines on the Witwatersrand. In 1915, when an urgent need arose for additional locomotives in German South West Africa during the First World War, two of the 0-4-2 ST locomotives were purchased second-hand by the South African Railways, for use in that territory. They were later classified as Class NG2.^[1]^[2]^[3]^[4]

Manufacturer

Between 1897 and 1901, several narrow-gauge 0-4-2 ST steam locomotives, built by Dickson Manufacturing Company of Scranton in Pennsylvania shortly before it merged with seven other manufacturing firms to form the American Locomotive Company (ALCO) in 1901, were delivered to various gold mines on the Witwatersrand by Arthur Koppel, acting as importing agent.^[1]^[2]^[3]^[4]

Characteristics

The engines had bar frames, with the cylinders arranged outside the frames and actuated by Stephenson valve gear. Their saddle-tanks had a 200 imperial gallons (909 litres) water capacity. Their operating boiler pressure was set at 130 pounds per square inch (896 kilopascals) and they had a 1,950 pounds-force (8.7 kilonewtons) tractive effort at 75% of boiler pressure.^[1]^[4]

First World War

In 1915, shortly after the outbreak of the First World War, the German South West Africa colony was occupied by the Union Defence Forces. Since a large part of the territory's railway infrastructure was destroyed or damaged by retreating German forces, an urgent need arose for locomotives for use on the narrow-gauge lines in that territory. The South African Railways (SAR) therefore bought two of these Dickson-built 0-4-2 ST locomotives second-hand, numbered them NG93 and NG94 and placed them in service in South West Africa (SWA).^[3]^[4]

Identity

The identity of these locomotives is difficult to prove, but the SAR diagram book for the Class NG2 gives dimensions which limit the possibilities to only three of the known Koppel imports. Two of these, Dickson works numbers 978 of 1897 and 1019 of 1898, had been delivered to the Lancaster Gold Mine in Roodepoort. That mine closed in June 1913 and the company was wound up in early 1915. It therefore seems a good probability that it were these two locomotives which the SAR bought for service in SWA.^[2]^[5]

A third locomotive with the same dimensions, for which no ownership history is known, was Dickson works no. 1102 of 1899. It is possible, but unproven, that this locomotive also went to Lancaster Gold Mine, since it was of identical dimensions to the other two.^[2]

Gauge

Although they were eventually classified as 2 ft (610 mm) locomotives along with the rest of the South African narrow-gauge locomotive fleet, they were actually constructed to 600 mm (1 ft 11+5⁄8 in) gauge.^[6]

Historically, the actual two-feet narrow-gauge rail spacing depended on whether or not the track was laid by a metricised country. German-built narrow-gauge lines in German South West Africa were therefore 600 mm (1 ft 11+5⁄8 in) gauge, while those in South Africa, built to Imperial standards, were 2 ft (610 mm) gauge.^[7]

In practice, however, the two gauges are still being treated as one and the same by, for example, the British Military. The same applied in South Africa, as part of the British Commonwealth at the time. The 3⁄8 inch (10 millimetres) difference was considered as insignificant and narrow-gauge locomotives regularly migrated between the lines laid to German standards in SWA and those laid to Imperial standards in South Africa.^[7]

Service

The two locomotives remained in SWA after the war. In 1920, they were both reboilered by the SAR using boilers supplied by Henschel and Son, and in the process they lost their saddle tanks. Since this modification effectively converted them to tankless tank locomotives, they were equipped with timber-bodied two-axle tenders to carry their water and additional coal.^[2]^[3]^[6]

Classification

A system of grouping narrow-gauge locomotives into classes was only introduced on the SAR somewhere between 1928 and 1930. At that point, the two locomotives were designated Class NG2.^[4]^[5]

Disposal

The Class NG2 locomotives spent their last working years on the SAR working at the Usakos workshops in SWA, until they were withdrawn from service in 1936. Engine no. NG93 was sold to the Zebediela citrus estates in northern Transvaal in 1937, where it was finally withdrawn from service by 1943. Engine no. NG94 was sold to Igusi Timbers in Rhodesia and remained in service there until c. 1961.^[2]^[3]

References

Wikimedia Commons has media related to South African Class NG2 0-4-2ST.

^ ^a ^b ^c Espitalier, T.J.; Day, W.A.J. (1945). The Locomotive in South Africa - A Brief History of Railway Development. Chapter VII - South African Railways (Continued). South African Railways and Harbours Magazine, October 1945. p. 781.
^ ^a ^b ^c ^d ^e ^f Information supplied by John N. Middleton
^ ^a ^b ^c ^d ^e Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 100–101. ISBN 0869772112.
^ ^a ^b ^c ^d ^e Espitalier, T.J.; Day, W.A.J. (1947). The Locomotive in South Africa - A Brief History of Railway Development. Chapter VII - South African Railways (Continued). South African Railways and Harbours Magazine, December 1947. p. 1033.
^ ^a ^b South African Railways and Harbours Narrow Gauge Locomotive Diagram Book, 2'0" Gauge, S.A.R. Mechanical Dept. Drawing Office, Pretoria, 28 November 1932
^ ^a ^b Unsourced drawing: Class N.G.2 – Locos. 93 & 94. Drawing ref 23082-3, letter d/d 21-4-1915, Ref 1/3523/6
^ ^a ^b Design and Maintenance Guide 09, Permanent Way, Chapter 7: Narrow Gauge Railways. Defence Estate Organisation, July 1997, Ministry of Defence, London : The Stationery Office, pp. 66-73. ISBN 0-11-772881-0. (Accessed on 4 July 2016)

Locomotives of South Africa

Steam

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Standard gauge	Cape 0-4-0T Blackie Cape 0-4-2 Cape 2-4-0T CGR 0-4-0ST Aid Natal 0-4-0ST Durban Natal 0-4-0WT Natal Natal 4-4-0T Perseverance
Cape gauge Tank engines	CGR 0-4-0ST 1873 CGR 0-4-0ST 1874 CGR 0-4-0ST 1881 CGR 0-4-0ST 1881 Coffee Pot CGR 0-6-0ST CGR 0-6-0T CGR 2-6-0ST 1900 CGR 2-6-0ST 1902 CGR 1st Class 0-4-0ST 1875 CGR 1st Class 0-4-0ST 1876 CGR 1st Class 2-6-0ST CGR 1st Class 4-4-0T CGR 2nd Class 4-4-0T CGR 3rd Class 2-6-0T CGR Railmotor CSAR Class C CSAR Class E CSAR Rack 4-6-4RT CSAR Railmotor Durban's Congella Durban's Edward Innes Durban's John Milne Durban's Sir Albert Port Elizabeth 0-4-0ST Kowie Railway 0-6-0T Kowie Railway 4-4-0T Metropolitan & Suburban 4-6-2T NGR 2-6-0T Durban & Pietermaritzburg NGR Class I 2-6-2T NGR Class K 0-4-0ST NGR Class K 0-6-0ST NGR Class K 2-6-0T NZASM 10 Tonner NZASM 13 Tonner NZASM 14 Tonner NZASM 18 Tonner NZASM 19 Tonner NZASM 32 Tonner NZASM 40 Tonner PPR 26 Tonner PPR 35 Tonner Portuguese SAR Class A SAR Class B SAR Class C SAR Class C1 SAR Class C2 SAR Class D SAR Class E SAR Class F SAR Class G SAR Class H SAR Class H1 SAR Class H2 SAR Class J SAR Class K SAR Railmotor SAR Dock 0-4-0ST SAR Dock 0-4-0T SWA 2-8-0T
Cape gauge Tender engines	CGR 1st Class 2-6-0 1876 BP CGR 1st Class 2-6-0 1876 Kitson CGR 1st Class 2-6-0 1879 CGR 1st Class 2-6-0 1891 CGR 1st Class 4-4-0 CGR 1st Class 4-4-0TT CGR 2nd Class 2-6-2TT CGR 3rd Class 4-4-0 1883 CGR 3rd Class 4-4-0 1884 CGR 3rd Class 4-4-0 1889 CGR 3rd Class 4-4-0 1898 CGR 3rd Class 4-4-0 1901 CGR 3rd Class 4-4-0 1903 CGR 4th Class 4-4-2 CGR 4th Class 4-6-0TT 1880 CGR 4th Class 4-6-0TT 1882 CGR 4th Class 4-6-0TT 1882 Joy CGR 4th Class 4-6-0TT 1884 CGR 5th Class 4-6-0 1890 CGR 5th Class 4-6-0 1891 NGR Havelock NGR Class I SAR Class Exp 1 SAR Class Exp 2 SAR Class Exp 3 SAR Class Exp 4 SAR Class Exp 5 SAR Class Exp 6 SAR Class S SAR Class S1 SAR Class S2 SAR Class 1 SAR Class 1A SAR Class 1B SAR Class 2 SAR Class 2C SAR Class 3 SAR Class 3A SAR Class 3B SAR Class 4 SAR Class 4A SAR Class 5 SAR Class 5A SAR Class 5B SAR Class 6 SAR Class 6A SAR Class 6B SAR Class 6C SAR Class 6D SAR Class 6E SAR Class 6F SAR Class 6G SAR Class 6H SAR Class 6J SAR Class 6K SAR Class 6L SAR Class 6Y SAR Class 6Z SAR Class 7 SAR Class 7A SAR Class 7B SAR Class 7C SAR Class 7D SAR Class 7E SAR Class 7F SAR Class 8 SAR Class 8A SAR Class 8B SAR Class 8C SAR Class 8D SAR Class 8E SAR Class 8F SAR Class 8R SAR Class 8X SAR Class 8Y SAR Class 8Z SAR Class 9 SAR Class 10 SAR Class 10A SAR Class 10B SAR Class 10C SAR Class 10D SAR Class 11 SAR Class 12 SAR Class 12A SAR Class 12B SAR Class 13 SAR Class 14 SAR Class 14A SAR Class 14B SAR Class 14C 1st SAR Class 14C 2nd SAR Class 14C 3rd SAR Class 14C 4th SAR Class 15 SAR Class 15A SAR Class 15B SAR Class 15C SAR Class 15CA SAR Class 15E SAR Class 15F SAR Class 16 SAR Class 16A SAR Class 16B SAR Class 16C SAR Class 16D SAR Class 16DA 1928 SAR Class 16DA 1930 SAR Class 16E SAR Class 17 SAR Class 18 SAR Class 19 SAR Class 19A SAR Class 19B SAR Class 19C SAR Class 19D SAR Class 20 SAR Class 21 SAR Class 23 SAR Class 24 SAR Class 25 SAR Class 25NC SAR Class 26 SAR Katanga SWA 2-8-0
Cape gauge Articulated engines	CGR Fairlie CGR Kitson-Meyer SAR Class FC SAR Class FD SAR Class GA SAR Class GB SAR Class GC SAR Class GCA SAR Class GD SAR Class GDA SAR Class GE SAR Class GEA SAR Class GF SAR Class GG SAR Class GH SAR Class GK SAR Class GL SAR Class GM SAR Class GMA SAR Class GO SAR Class HF SAR Class KM SAR Class MA SAR Class MB SAR Class MC SAR Class MC1 SAR Class MD SAR Class ME SAR Class MF SAR Class MG SAR Class MH SAR Class MJ SAR Class MJ1 SAR Class U
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Electric

Amcoal Class E38

Gas-electric

SAR Gas-electric

Diesel

Cape gauge Diesel–electric	PRASA Class Afro 4000 SAR Class DS SAR Class DS1 SAR Class 31-000 SAR Class 32-000 SAR Class 32-200 SAR Class 33-000 SAR Class 33-200 SAR Class 33-400 SAR Class 34-000 SAR Class 34-200 SAR Class 34-400 SAR Class 34-500 SAR Class 34-600 SAR Class 34-800 SAR Class 34-900 SAR Class 35-000 SAR Class 35-200 SAR Class 35-400 SAR Class 35-600 TFR Class 35-800 SAR Class 36-000 SAR Class 36-200 SAR Class 37-000 Spoornet Class 39-000 TFR Class 39-200 TFR Class 43-000 TFR Class 44-000 TFR Class 45-000
2' gauge Diesel–electric	SAR Class 91-000
Cape gauge Diesel–hydraulic	SAR Class 61-000
Cape gauge Electro-diesel	Spoornet Class 38-000

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