South African Class GD 2-6-2+2-6-2

From Wikipedia, the free encyclopedia
Jump to: navigation, search
South African Class GD 2-6-2+2-6-2
SAR Class GD (2-6-2+2-6-2).jpg
Class GD Garratt, c. 1965
Type and origin
Power type Steam
Designer Beyer, Peacock and Company
Builder Beyer, Peacock and Company
Serial number 6263-6266, 6281-6290
Model Class GD
Build date 1925-1926
Total produced 14
Specifications
Configuration:
 • Whyte 2-6-2+2-6-2 (Double Prairie)
 • UIC 1'C1'+1'C1'h4
Driver 3rd & 4th coupled axles
Gauge 3 ft 6 in (1,067 mm) Cape gauge
Leading dia. 28 12 in (724 mm)
Coupled dia. 46 in (1,168 mm)
Trailing dia. 28 12 in (724 mm)
Wheelbase 58 ft 4 in (17,780 mm)
 • Engine 18 ft 9 in (5,715 mm) each
 • Coupled 8 ft 6 in (2,591 mm) each
Pivot centres 30 ft 6 in (9,296 mm)
Length:
 • Over couplers 65 ft 34 in (19,831 mm)
Height 12 ft 10 14 in (3,918 mm)
Frame type Plate
Axle load 12 LT 15 cwt (12,950 kg)
 • Leading 11 LT 7 cwt (11,530 kg) front
11 LT 16 cwt (11,990 kg) rear
 • 1st coupled 12 LT 10 cwt (12,700 kg)
 • 2nd coupled 12 LT 10 cwt (12,700 kg)
 • 3rd coupled 12 LT 10 cwt (12,700 kg)
 • 4th coupled 12 LT 11 cwt (12,750 kg)
 • 5th coupled 12 LT 11 cwt (12,750 kg)
 • 6th coupled 12 LT 15 cwt (12,950 kg)
 • Trailing 7 LT 15 cwt (7,874 kg) front
7 LT 16 cwt (7,925 kg) rear
Adhesive weight 75 LT 7 cwt (76,560 kg)
Loco weight 114 LT 1 cwt (115,900 kg)
Fuel type Coal
Fuel capacity 5 LT (5.1 t) as built
9 LT (9.1 t) no. 2220
Water cap 2,300 imp gal (10,500 l) front
1,500 imp gal (6,820 l) rear
Firebox type Belpaire
 • Firegrate area 40 sq ft (3.7 m2)
Boiler:
 • Pitch 7 ft 9 14 in (2,369 mm)
 • Diameter 6 ft (1,829 mm)
 • Tube plates 10 ft 7 78 in (3,248 mm)
 • Small tubes 184: 2 in (51 mm)
 • Large tubes 32: 5 12 in (140 mm)
Boiler pressure 180 psi (1,241 kPa)
Safety valve Ramsbottom
Heating surface 1,689 sq ft (156.9 m2)
 • Tubes 1,517 sq ft (140.9 m2)
 • Firebox 172 sq ft (16.0 m2)
Superheater:
 • Heating area 370 sq ft (34 m2)
Cylinders Four
Cylinder size 15 in (381 mm) bore
24 in (610 mm) stroke
Valve gear Walschaerts
Valve type Piston
Couplers Bell link-and-pin
AAR knuckle (1940s-1950s)
Performance figures
Tractive effort 31,690 lbf (141.0 kN) @ 75%
Career
Operators South African Railways
Class Class GD
Number in class 14
Numbers 2220-2223, 2228-2237
Delivered 1925-1926
First run 1925
Withdrawn 1967

The South African Railways Class GD 2-6-2+2-6-2 of 1925 was an articulated steam locomotive.

In 1925, the South African Railways placed four Class GD Garratt articulated locomotives with a 2-6-2+2-6-2 Double Prairie type wheel arrangement in branchline service. Another ten of these locomotives were delivered in 1926.[1][2][3][4][5]

Manufacturer[edit]

The Class GD 2-6-2+2-6-2 Double Prairie type Garratt locomotive was marginally larger and more powerful than its predecessor Class GC, with a heavier axle loading, but also intended for branchline work. Four locomotives were delivered by Beyer, Peacock and Company in December 1925, numbered in the range from 2220 to 2223. These were followed in January 1926 by ten more from the same manufacturer, seven of them built in 1925 and numbered in the range from 2228 to 2234, and the last three built in 1926 and numbered in the range from 2235 to 2237.[1][2][3][4][5][6]

Characteristics[edit]

They locomotives were superheated and had plate frames, Belpaire fireboxes, piston valves and Walschaerts valve gear.[3][4][5]

As built, their coal bunkers had a 5 long tons (5.1 tonnes) capacity. At some stage, the coal bunker of no. 2220 was enlarged to a 9 long tons (9.1 tonnes) capacity.[4][5]

Service[edit]

The locomotives were placed in service on the North Coast and the Pietermaritzburg to Franklin lines in Natal. From 1926, some were allocated to Paardeneiland to work on the line from Cape Town across Sir Lowry's Pass to Caledon in the Overberg. They were the first Garratts to work the Caledon line and were later joined by the two Class GK Garratts after the New Cape Central Railway was absorbed by the SAR in 1925.[1][2][7]

Class GD no. 2222 ID.jpg

The Class GD proved themselves as handy and trouble-free locomotives and gave good service for more than forty years. They were later allocated to the Cape Midland system to work across the Montagu Pass between George and Oudtshoorn for many years until they were finally all allocated to the Port Alfred branch. They remained there until they were withdrawn from service in 1967.[1][3]

Illustration[edit]

References[edit]

  1. ^ a b c d Holland, D.F. (1972). Steam Locomotives of the South African Railways, Volume 2: 1910-1955 (1st ed.). Newton Abbott, Devon: David & Charles. pp. 47–48. ISBN 978-0-7153-5427-8. 
  2. ^ a b c Espitalier, T.J.; Day, W.A.J. (1946). The Locomotive in South Africa - A Brief History of Railway Development. Chapter VII - South African Railways (Continued). South African Railways and Harbours Magazine, January 1946. p. 12.
  3. ^ a b c d Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. p. 90. ISBN 0869772112. 
  4. ^ a b c d South African Railways & Harbours/Suid Afrikaanse Spoorweë en Hawens (15 Aug 1941). Locomotive Diagram Book/Lokomotiefdiagramboek, 3'6" Gauge/Spoorwydte. SAR/SAS Mechanical Department/Werktuigkundige Dept. Drawing Office/Tekenkantoor, Pretoria. p. 31.
  5. ^ a b c d South African Railways & Harbours/Suid Afrikaanse Spoorweë en Hawens (15 Aug 1941). Locomotive Diagram Book/Lokomotiefdiagramboek, 2'0" & 3'6" Gauge/Spoorwydte, Steam Locomotives/Stoomlokomotiewe. SAR/SAS Mechanical Department/Werktuigkundige Dept. Drawing Office/Tekenkantoor, Pretoria. p. 31.
  6. ^ Hamilton, Gavin N., The Garratt Locomotive - Garratt Locomotives produced by Beyer, Peacock, retrieved 10 November 2012 
  7. ^ Soul of A Railway, System 1, Part 7: The Caledon train. Caption 42 (Accessed on 29 November 2016)