South African Class NG10 4-6-2

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 12 in (521 mm)
Tender wheels 22 in (559 mm)
Wheelbase 40 ft 3 34 in (12,287 mm)
  Engine 19 ft 7 12 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 38 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 34 in (3,778 mm)
  Small tubes 119: 1 78 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 12 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Withdrawn 1962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

References

  1. 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.
  2. 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.
  3. 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
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