South African Class NG10 4-6-2

Class NG10 no. NG62, c. 1930

Type and origin
Power type	Steam
Designer	Baldwin Locomotive Works
Builder	Baldwin Locomotive Works
Serial number	42633-42638
Build date	1916
Total produced	6

Specifications
Configuration	4-6-2 (Pacific)
Driver	2nd coupled axle
Gauge	2 ft (610 mm) narrow
Leading dia.	22 in (559 mm)
Coupled dia.	36 in (914 mm)
Trailing dia.	20 ¹⁄₂ in (521 mm)
Tender wheels	22 in (559 mm)
Wheelbase	40 ft 3 ³⁄₄ in (12,287 mm)
• Engine	19 ft 7 ¹⁄₂ in (5,982 mm)
• Leading	4 ft (1,219 mm)
• Coupled	6 ft 6 in (1,981 mm)
• Tender	13 ft 9 in (4,191 mm)
• Tender bogie	4 ft 3 in (1,295 mm)
Length:
• Over couplers	47 ft 1 ³⁄₈ in (14,361 mm)
Height	10 ft 6 in (3,200 mm)
Frame type	Bar
Axle load	6 LT 15 cwt 3 qtr (6,896 kg)
• Leading	5 LT 3 cwt (5,233 kg)
• 1st coupled	6 LT 7 cwt 3 qtr (6,490 kg)
• 2nd coupled	6 LT 15 cwt 3 qtr (6,896 kg)
• 3rd coupled	6 LT 10 cwt 2 qtr (6,630 kg)
• Trailing	3 LT 12 cwt (3,658 kg)
• Tender bogie	9 LT 7 cwt 2 qtr (9,525 kg)
• Tender axle	4 LT 13 cwt 3 qtr (4,763 kg)
Adhesive weight	19 LT 14 cwt (20,020 kg)
Loco weight	28 LT 9 cwt (28,910 kg)
Tender weight	18 LT 15 cwt (19,050 kg)
Total weight	47 LT 4 cwt (47,960 kg)
Tender type	2-axle bogies
Fuel type	Coal
Fuel capacity	4 LT (4.1 t)
Water cap	1,930 imp gal (8,770 l)
Firebox type	Belpaire
• Firegrate area	14.2 sq ft (1.32 m²)
Boiler:
• Pitch	5 ft (1,524 mm)
• Diameter	3 ft 6 in (1,067 mm)
• Tube plates	12 ft 4 ³⁄₄ in (3,778 mm)
• Small tubes	119: 1 ⁷⁄₈ in (48 mm)
Boiler pressure	180 psi (1,241 kPa)
Heating surface	783 sq ft (72.7 m²)
• Tubes	727 sq ft (67.5 m²)
• Firebox	56 sq ft (5.2 m²)
Cylinders	Two
Cylinder size	13 ¹⁄₂ in (343 mm) bore 18 in (457 mm) stroke
Valve gear	Walschaerts
Valve type	Slide
Couplers	Bell lift-hook

Performance figures
Tractive effort	12,302 lbf (54.72 kN) @ 75%

Career
Operators	South African Railways
Class	Class NG10
Number in class	6
Numbers	NG61-NG66
Nicknames	Sixty
Delivered	1916
First run	1916
Withdrawn	1962

The 2nd coupled axle had flangeless wheels

The South African Railways Class NG10 4-6-2 of 1916 was a narrow gauge steam locomotive.

In 1916, the South African Railways placed six steam locomotives with a 4-6-2 Pacific type wheel arrangement in service on the Langkloof narrow gauge line. When a system of grouping narrow gauge locomotives into classes was eventually introduced somewhere between 1928 and 1930, they were classified as Class NG10.^[1]^[2]

Manufacturer

During the First World War, the usual British locomotive suppliers were hard pressed to satisfy British and foreign requirements. This led to several new locomotive types for the South African Railways (SAR) being ordered from North American builders.^[1]

In 1916, the SAR placed an order with the Baldwin Locomotive Works in the United States of America for six narrow gauge locomotives with a 4-6-2 Pacific type wheel arrangement. The locomotives were delivered in 1916 and were numbered in the range from NG61 to NG66.^[1]^[2]^[3]

Characteristics

The locomotives were more powerful than previous types and, with their more commodious cabs, proved popular with the crews. Since a classification system for narrow gauge locomotives had not yet been adopted by the SAR, they became popularly known as the Sixties, based on their engine number range.^[1]

They were typically American in appearance, with an ornate chimney cap and steam dome, as well as a third engine number on a disk on the front of the smokebox door, in addition to the usual cabside number plates. They had outside bar frames, Belpaire fireboxes and Walschaerts valve gear.^[1]

Service

They were erected at the Uitenhage workshops and placed in service on the Avontuur Railway between Port Elizabeth and Avontuur in the Langkloof, where they spent most of their working lives. Much of that time, they worked out of Loerie, either assisting up the bank or on the Patensie branch.^[1]^[2]

In 1948, numbers NG63 and NG64 were transferred to South West Africa, where they performed yard work, while the rest remained on the Avontuur line, performing similar work around Humewood Road in Port Elizabeth.^[1]

Classification and withdrawal

The system of grouping narrow gauge locomotives into classes was only adopted by the SAR somewhere between 1928 and 1930. At that point, these locomotives were classified as Class NG10.^[1]^[3]

All six were withdrawn from service by 1962, as a direct result of the regauging of all the narrow gauge lines in South West Africa to Cape gauge. Some of the older narrow gauge locomotive stock in that territory were retired and scrapped, while the rest were all transferred to South Africa.^[1]

Illustration

No. NG61 in steam at Humewood Road Locomotive in January 1961

References

1 2 3 4 5 6 7 8 9 Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 104–105, 110. ISBN 0869772112.
1 2 3 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. 782.
1 2 South African Railways and Harbours Narrow Gauge Locomotive Diagram Book, 2'0" Gauge, S.A.R. Mechanical Dept. Drawing Office, Pretoria, 28 November 1932

Wikimedia Commons has media related to South African Class NG10 (4-6-2).

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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