NGR Class N 4-6-2T 1906

This article is about one of several different Natal Government Railways locomotive types to be designated "Class N". For other NGR Class N locomotives, see Natal Government Railways Class N locomotives.

NGR Class N 4-6-2T 1906
South African NG 4-6-2T 1906

NGR Class N 4-6-2T no. 2

Type and origin
Power type	Steam
Designer	Natal Government Railways (D.A. Hendrie)
Builder	Hunslet Engine Company
Serial number	892-893
Build date	1906
Total produced	2

Specifications
Configuration	4-6-2T (Pacific)
Driver	2nd coupled axle
Gauge	2 ft (610 mm) narrow
Leading dia.	18 in (457 mm)
Coupled dia.	30 in (762 mm)
Trailing dia.	20 in (508 mm)
Wheelbase	17 ft (5,182 mm)
• Leading	3 ft 6 in (1,067 mm)
• Coupled	5 ft 9 in (1,753 mm)
Length:
• Over couplers	24 ft ¹⁄₂ in (7,328 mm)
Height	9 ft 4 ¹⁄₂ in (2,858 mm)
Frame type	Plate
Axle load	5 LT 9 cwt 1 qtr (5,550 kg)
Loco weight	23 LT 19 cwt (24,330 kg)
Fuel type	Coal
Fuel capacity	22 long hundredweight 2 qtr (1.1 t)
Water cap	750 imp gal (3,410 l)
Firebox type	Round-top
• Firegrate area	11 sq ft (1.0 m²)
Boiler:
• Pitch	4 ft 6 in (1,372 mm)
• Diameter	3 ft 4 ¹⁄₂ in (1,029 mm) outside
• Tube plates	10 ft 2 in (3,099 mm)
• Small tubes	124: 1 ³⁄₄ in (44 mm)
Boiler pressure	165 psi (1,138 kPa)
Safety valve	Ramsbottom
Heating surface	132 sq ft (12.3 m²)
Cylinders	Two
Cylinder size	11 ¹⁄₂ in (292 mm) bore 15 in (381 mm) stroke
Valve gear	Walschaerts
Valve type	"D" slide
Couplers	Bell link-and-pin

Performance figures
Tractive effort	8,183 lbf (36 kN) @ 75%
Factor of adh	4.39:1

Career
Operators	Natal Government Railways South African Railways Moçâmedes Railway
Class	Class N
Number in class	2
Numbers	NGR 1-2, SAR NG1-NG2
Delivered	1906
First run	1906
Withdrawn	1915

The Natal Government Railways Class N 4-6-2T of 1906 was a South African steam locomotive from the pre-Union era in the Natal Colony.

In April 1906, the Natal Government Railways placed its first two 4-6-2T narrow gauge tank steam locomotives in service. In 1912, when these locomotives were assimilated into the South African Railways, they retained their engine numbers, but with an "NG" prefix added. They were sold to the Moçâmedes Railway in Portuguese West Africa in 1915.^[1]^[2]^[3]^[4]

Natal's narrow gauge

By 1906, the Natal Government had realised that light railways were essential as feeders to open up fertile districts which were distant from the existing main- and branchlines, particularly when the intervening stretches of country were difficult from an engineering point of view. The construction of the first narrow gauge railway line in Natal was therefore approved.^[1]

The line was 28 ³⁄₄ miles (46.3 kilometres) long and stretched from Estcourt to the irrigation settlement of Weenen, an alluvial flat of about 5,000 acres (2,000 hectares) adjoining the Bushman's River. The maximum gradient on this line was 1 in 33 (3⅓%) compensated, with a minimum curvature of 175 feet (53 metres). It was laid with 35 pounds per yard (17 kilograms per metre) rail.^[1]

Manufacturer

The Class N 4-6-2T tank locomotive was designed by D.A. Hendrie, Locomotive Superintendent of the Natal Government Railways (NGR) from 1902 to 1910. It was the first narrow gauge locomotive of the NGR.^[3]

An order for the construction of two of these locomotives was placed with Hunslet Engine Company in 1906. They were delivered in April 1906, numbered 1 and 2, and were placed in construction service on the new narrow gauge line to Weenen.^[1]^[3]

Characteristics

D.A. Hendrie

Commonly known as the Hunslet Side Tanks, the locomotives had outside plate frames and used Walschaerts valve gear. The firebox was 3 feet 4 ¹⁄₂ inches (1,029 millimetres) long and, to obtain the required grate area, the width was extended to 4 ft 4 ¹⁄₂ in (1,334 mm) at the foundation ring. To obtain a liberal firebox depth, the frames were opened out for some length at the rear end, with each frame constructed in two pieces which were connected by a cross strether in front of the firebox throat plate.^[1]^[3]

The cylinders were arranged horizontally outside the plate frames, while the flat "D" type slide valves were arranged above the cylinders and actuated by Walschaerts valve gear.^[1]

Service

Natal Government Railways

The Weenen narrow gauge line was opened to regular passenger and goods traffic on 18 April 1907. As a result of tick fever restrictions upon the movement of ox wagon transport, a limited goods traffic service was already inaugurated on 4 October 1906, while the line was still under construction. This limited service was by construction train from Estcourt to Halfway House, a distance of 18 miles (29 kilometres). By the end of 1906, this limited service had been extended all the way to Weenen.^[1]^[5]

The two engines performed well and were capable of hauling 80 long tons (81.3 tonnes) loads up the maximum gradients with comparative ease, at about 8 mph (13 km/h). On easier sections of the line, they were able to attain a maximum speed of 15 mph (24 km/h).^[1]

When a locomotive classification system was introduced on the NGR by 1908, all narrow gauge locomotives were designated Class N.^[6]

South African Railways

When the Union of South Africa was established on 31 May 1910, the three Colonial government railways (Cape Government Railways, NGR and Central South African Railways) were united under a single administration to control and administer the railways, ports and harbours of the Union. Although the South African Railways and Harbours came into existence in 1910, the actual classification and renumbering of all the rolling stock of the three constituent railways required careful planning and was only implemented with effect from 1 January 1912.^[2]^[7]

The two locomotives were not renumbered by the South African Railways (SAR) in 1912, but had the letters NG, for narrow gauge, prefixed to their existing numbers. They remained unclassified on the SAR, since a classification system for narrow gauge locomotives was only adopted in the late 1920s, after they had been withdrawn from service.^[2]

Moçâmedes Railway

In 1915, both locomotives were sold to the Moçâmedes Railway in Portuguese West Africa.^[3]

References

1 2 3 4 5 6 7 8 Espitalier, T.J.; Day, W.A.J. (1944). The Locomotive in South Africa - A Brief History of Railway Development. Chapter III - Natal Government Railways (Continued). South African Railways and Harbours Magazine, September 1944. p. 669.
1 2 3 Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer's Office, Pretoria, January 1912, p. 47 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
1 2 3 4 5 Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 110–111, 157. ISBN 0869772112.
↑ Dulez, Jean A. (2012). Railways of Southern Africa 150 Years (Commemorating One Hundred and Fifty Years of Railways on the Sub-Continent - Complete Motive Power Classifications and Famous Trains - 1860-2011) (1st ed.). Garden View, Johannesburg, South Africa: Vidrail Productions. p. 231. ISBN 9 780620 512282.
↑ Year in service 1906
↑ The Railway Report for year ending 31 Dec. 1908, Natal Government Railways, p. 39, par 14.
↑ The South African Railways - Historical Survey. Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd., Published c. 1978, p. 25.

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Locomotives of Natal

4' 8½" gauge	Natal 0-4-0ST Durban Natal 0-4-0WT Natal Natal 4-4-0T Perseverance

3' 6" gauge	Durban's Congella Durban's Edward Innes Durban's John Milne Durban's Sir Albert NGR Class A 1905 NGR Class A 1910 NGR Class B 4-8-0 1904 NGR Class B 4-8-0 1910 NGR Class B 4-8-2 1906 NGR Class B 4-8-2 1909 NGR Class B 4-8-2 1910 NGR Class C 4-8-2T NGR Class C 4-10-2T NGR Class D NGR Class E NGR Class F NGR Class G NGR Class H 4-6-2T NGR Class H 4-6-4T NGR Class I 2-6-0 NGR Class I 2-6-2T NGR Class K 0-4-0ST NGR Class K 0-6-0ST NGR Class K 2-6-0T NGR Class L 4-8-0 NGR Durban & Pietermaritzburg NGR Havelock NGR Mallet 1909 NGR Mallet 1910

2' gauge	NGR Class N 1906 NGR Class N 1907 NGR Class N 1911

List of South African locomotive classes South African locomotive history

Locomotives of South Africa

Steam

7' ¼" gauge	East London Harbour 0-4-0 Table Bay Harbour 0-4-0ST Table Bay Harbour 0-4-0T Table Bay Harbour 0-4-0WT

4' 8½" 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

3' 6" gauge Tank engines	CGR 0-4-0ST 1873 CGR 0-4-0ST 1874 CGR 0-4-0ST 1881 Coffee Pot CGR 0-6-0ST 1902 CGR 0-6-0T 1876 Back-to-Back 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 1876 CGR 1st Class 4-4-0T 1875 CGR 2nd Class 4-4-0T 1882 CGR 3rd Class 2-6-0T CGR Railmotor CSAR Class C CSAR Class E CSAR Rack CSAR Railmotor DSWA Eight-Coupled Tank 2-8-0T Durban's Congella Durban's Edward Innes Durban's John Milne Durban's Sir Albert Port Elizabeth Harbour 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 0-4-0ST 1903 SAR 0-4-0T no. 69 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 Clayton

3' 6" gauge Tender engines	CGR 1st Class 2-6-0 1876 Beyer, Peacock 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 1879 CGR 1st Class 4-4-0TT 1881 CGR 2nd Class 2-6-2TT 1875 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 Joy 1882 CGR 4th Class 4-6-0TT 1884 CGR 5th Class 4-6-0 1890 CGR 5th Class 4-6-0 1891 DSWA Eight-Coupled Tender 2-8-0 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 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

3' 6" 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

2' 6" gauge	Cape Copper 0-6-0T 1871 Cape Copper Britannia Cape Copper Caledonia Cape Copper Clara Cape Copper Condenser Cape Copper Scotia Namaqua Copper Pioneer

2' & 600mm gauges	ACR Class NG-G16A CGR NG 0-6-0T CGR NG 4-6-2T CGR Type A 2-6-4T CGR Type C 0-4-0T DSWA Class Ha DSWA Class Hb DSWA Class Hc DSWA Class Hd DSWA Jung DSWA Zwillinge NGR Class N 4-6-2T SAR Dutton SAR NG 0-4-0T 1899 SAR Class NG1 SAR Class NG2 SAR Class NG3 SAR Class NG4 SAR Class NG5 SAR Class NG6 SAR Class NG7 SAR Class NG8 SAR Class NG9 SAR Class NG10 SAR Class NG-G11 SAR Class NG-G12 SAR Class NG-G13 SAR Class NG-G14 SAR Class NG15 SAR Class NG-G16

Electric

Amcoal Class E38

Gas-electric

Gas-electric

Diesel

3' 6" 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 SAR Class 36-000 SAR Class 36-200 SAR Class 37-000 Spoornet Class 39-000 TFR Class 35-800 TFR Class 39-200 TFR Class 43-000 TFR Class 44-000

2' gauge Diesel-electric	SAR Class 91-000

3' 6" gauge Diesel-hydraulic	SAR Class 61-000

3' 6" gauge Electro-diesel	Spoornet Class 38-000

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