South African Class NG4 4-6-2T

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 1911
South African Class NG4 4-6-2T

No. NG16, restored at Sandstone Estates, 4 May 2013

Type and origin
Power type	Steam
Designer	Natal Government Railways (D.A. Hendrie)
Builder	Kerr, Stuart and Company
Serial number	1207-1208, 1294-1295, 1342-1344
Model	Kerr Stuart Side-tank
Build date	1911-1914
Total produced	7

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.	21 in (533 mm)
Wheelbase	17 ft 9 in (5,410 mm)
• Leading	3 ft 6 in (1,067 mm)
• Coupled	5 ft 9 in (1,753 mm)
Length:
• Over couplers	24 ft 11 in (7,595 mm)
Height	9 ft 4 ¹⁄₂ in (2,858 mm)
Frame type	Plate
Axle load	6 LT 3 cwt (6,249 kg)
• Leading	6 LT 19 cwt (7,062 kg)
• 1st coupled	6 LT (6,096 kg)
• 2nd coupled	6 LT 3 cwt (6,249 kg)
• 3rd coupled	6 LT 1 cwt (6,147 kg)
Adhesive weight	18 LT 4 cwt (18,490 kg)
Loco weight	29 LT 14 cwt (30,180 kg)
Fuel type	Coal
Fuel capacity	21 long hundredweight 2 qtr (1.1 t)
Water cap	820 imp gal (3,730 l)
Firebox type	Belpaire
• Firegrate area	11 sq ft (1.0 m²)
Boiler:
• Pitch	4 ft 9 in (1,448 mm)
• Diameter	3 ft 3 ¹⁄₂ in (1,003 mm)
• Tube plates	11 ft 2 ¹⁄₈ in (3,407 mm)
• Small tubes	128: 1 ³⁄₄ in (44 mm)
Boiler pressure	165 psi (1,138 kPa)
Safety valve	Ramsbottom
Heating surface	700.9 sq ft (65.12 m²)
• Tubes	655.4 sq ft (60.89 m²)
• Firebox	45.5 sq ft (4.23 m²)
Cylinders	Two
Cylinder size	11 ¹⁄₂ in (292 mm) bore 15 in (381 mm) stroke
Valve gear	Walschaerts
Couplers	Bell link-and-pin

Performance figures
Tractive effort	8,183 lbf (36.40 kN) @ 75%

Career
Operators	Natal Government Railways South African Railways
Class	Class NG4
Number in class	7
Numbers	NGR no. 10-11 SAR no. NG10-NG16
Delivered	1911-1914
First run	1911
Withdrawn	1948
Preserved	No. NG16

The South African Railways Class NG4 4-6-2T of 1911 was a narrow gauge steam locomotive from the pre-Union era in the Natal Colony.

In 1911, shortly before being amalgamated into the South African Railways, the Natal Government Railways placed the first two of seven 4-6-2T Pacific type narrow gauge tank steam locomotives in service. In 1912, when these two locomotives were assimilated into the South African Railways, they retained their engine numbers, but with an "NG" prefix added.^[1]^[2]

Five more of these locomotives were delivered to the South African Railways in 1913 and 1914. When a system of grouping narrow gauge locomotives into classes was eventually introduced somewhere between 1928 and 1930, they were all designated Class NG4.^[1]

Natal's narrow gauge

Alfred County railway

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.^[2]

The third narrow gauge railway line in Natal was the Alfred County Railway, which ran from Port Shepstone on the South Coast to Harding. The first section to Paddock was opened on 8 November 1911.^[3]

Manufacturers

D.A. Hendrie

Like their two predecessor locomotives, the Hunslet Side-tank of 1906 and the Hawthorn Leslie Side-tank of 1907, this third batch of narrow gauge 4-6-2T Pacific tank locomotives of the Natal Government Railways (NGR) were also built to the design of NGR Locomotive Superintendent D.A. Hendrie, using the Hawthorn Leslie drawings for the Class NG3. The majority of their parts were interchangeable with those of the earlier engines.^[2]^[4]

Between 1911 and 1913, the High Commissioner for the Union of South Africa placed three orders, for altogether seven of these locomotives, with Kerr, Stuart and Company.^[2]^[5]

Two locomotives were ordered on 10 January 1911. They were dispatched from the factory in September of that same year, with Kerr, Stuart works numbers 1207 and 1208, for delivery to the Natal Government Railways. They were numbered NGR 10 and 11 and designated Class N on the NGR roster.^[2]^[5]
Two more were ordered on 28 September 1912. They were dispatched from the factory in April and May 1913, for delivery to the South African Railways (SAR), with works numbers 1294 and 1295. They were numbered SAR NG12 and NG13.^[2]^[5]
Three more were ordered on 10 June 1913. They were dispatched from the factory in July 1914, with works numbers 1342 to 1344. They were numbered SAR NG14 to NG16.^[2]^[5]

This last order also included the final two of the Class NG8 4-6-0 tender locomotives, which were delivered with Kerr, Stuart works numbers 1345 and 1346.^[1]^[4]^[6]

Characteristics

These locomotives were virtually identical to the Hawthorn Leslie Side Tanks, except for their boiler and firebox design. The boiler pitch had been raised from 4 feet 6 inches (1,372 millimetres) to 4 feet 9 inches (1,448 millimetres) to make a larger firebox possible. They had outside plate frames, Belpaire fireboxes and used Walschaerts valve gear.^[1]^[2]^[4]

The most obvious visual differences from the Hawthorn Leslie locomotives, were the higher side tanks, the less ornate sand boxes on top of the boiler and the Belpaire firebox hump. As built, they had no headlamps, but some were later equipped with the large oil headlamps which were in use on the SAR at the time.^[7]

Classification

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.^[6]^[8]

In 1912, narrow gauge locomotives were included in the SAR's narrow gauge numbering scheme, but were not classified. They retained their existing engine numbers, but with an "NG" prefix to the number, for narrow gauge. The two locomotives which had been delivered in 1911, listed as "Late Administration S.A.R. numbers 10 and 11" in the renumbering lists, were therefore renumbered NG10 and NG11.^[6]

The system of grouping SAR narrow gauge locomotives into classes was only adopted somewhere between 1928 and 1930 and, at that point, these seven locomotives were designated Class NG4.^[1]^[2]^[6]^[9]

Service

Railways

The Class NG4 was placed in service on the Alfred County Railway, of which the first section to Paddock was opened on 8 November 1911, to work from Port Shepstone on the Natal South Coast to Harding. Except no. NG12, all remained working on the three Natal narrow gauge branches for their entire service lives.^[1]^[3]^[4]^[7]

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. In 1917, no. NG12 was transferred to the Defence Department for service in South West Africa. It returned to Natal after the war.^[1]^[10]

Industrial

No. NG11 was sold to the Savane Sawmills of Rhodesian Timber Concessions in 1942. The last one to remain in service, no. NG16, was sold to the Rustenburg Platinum Mines (RPM) in 1948, where it was renumbered to RPM no. 8.^[1]^[4]^[7]

Preservation

No. NG16 is the only known survivor. RPM returned it to the SAR for preservation in 1969 or 1970, but it was only restored back to working order after Sandstone Estates acquired it on 31 January 2003.

Illustration

Kerr, Stuart and Company builder's picture of no. NG10, works no. 1207
SAR Class NG4 no. NG16
No. NG16, RPM no. 8, at Port Shepstone, 17 April 1970
No. NG16, at work at Sandstone Estates, 22 April 2007

References

1 2 3 4 5 6 7 8 Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 101–102, 110. ISBN 0869772112.
1 2 3 4 5 6 7 8 9 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. 670.
1 2 Statement Showing, in Chronological Order, the Date of Opening and the Mileage of Each Section of Railway, Statement No. 19, p. 186, ref. no. 200954-13
1 2 3 4 5 Plant, K.P. (1971). Kerr Stuarts for South Africa. The Industrial Railway Record, No. 37, June 1971. pp. 78-85.
1 2 3 4 Jux, Frank (1991). Kerr Stuart & Co. Ld. – Locomotive Works List (1st ed.). England: Frank Jux.
1 2 3 4 Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer's Office, Pretoria, January 1912, pp. 16, 47 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
1 2 3 Railway Modelling Scene, South Africa, circa 1985, articles written by Neill Mardell
↑ The South African Railways - Historical Survey. Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd., Published c. 1978, p. 25.
↑ South African Railways and Harbours Narrow Gauge Locomotive Diagram Book, 2'0" Gauge, S.A.R. Mechanical Dept. Drawing Office, Pretoria, 28 November 1932
↑ 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.

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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 0-4-0VB Table Bay 0-4-0ST Table Bay 0-4-0T Table Bay 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 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

3' 6" 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

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 John King & Miner Cape Copper Britannia Cape Copper Caledonia Cape Copper Clara Cape Copper Condenser Cape Copper Scotia Namaqua Copper Pioneer Walvis Bay 2-4-2T Hope

2' & 600mm gauges	ACR Class NG-G16A CGR NG 0-4-0T CGR NG 0-6-0T CGR NG 4-6-2T CGR Type A 2-6-4T CGR Type C 0-4-0T NGR Class N 4-6-2T SAR Dutton SAR NG 0-4-0T 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 SWA Class Ha SWA Class Hb SWA Class Hc SWA Class Hd SWA Jung SWA Zwillinge

Electric

Amcoal Class E38

Gas-electric

SAR 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 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

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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