South African Class GG 2-6-2+2-6-2
21 ft 4+1⁄2 in (6,515 mm) each
14 LT 5 cwt (14,480 kg) rear
12 LT 5 cwt (12,450 kg) rear
1,100 imp gal (5,000 L) rear
26 in (660 mm) stroke
Performance figures | |
---|---|
Maximum speed | 57 mph (92 km/h) |
Tractive effort | 39,900 lbf (177 kN) @ 75% |
Career | |
---|---|
Operators | South African Railways |
Class | Class GG |
Number in class | 1 |
Numbers | 2290 |
Delivered | 1925 |
First run | 1925 |
Withdrawn | 1938 |
Scrapped | 1947 |
The South African Railways Class GG 2-6-2+2-6-2 of 1925 was an articulated steam locomotive.
In 1925, the South African Railways placed a single Class GG Garratt articulated steam locomotive with a 2-6-2+2-6-2 Double Prairie type wheel arrangement in fast mainline passenger service.[1][2][3][4][5]
Manufacturers
The Class GG 2-6-2+2-6-2 Double Prairie type Garratt locomotive was a development of the Class GB. It was designed for the South African Railways (SAR) with large coupled wheels for fast passenger service on mainline duties. A single locomotive, no. 2290, was delivered from Beyer, Peacock and Company in 1925. It was superheated, with a plate frame, a Belpaire firebox and Walschaerts valve gear. The Class GG was the only Garratt locomotive on the SAR that was intended primarily for passenger working.[1][3][4][5][6]
Characteristics
At 57 inches (1,448 millimetres) diameter, the Class GG had the largest coupled wheels yet seen on a Garratt locomotive in South Africa. An innovation was a coal pusher at the back of the coal bunker, designed to ease the work of the fireman by pushing the coal forward to the front of the bunker when required. It was the only instance of this appliance being used on any SAR locomotive.[1]
To keep costs down, the cylinders were not enlarged to compensate for the increased wheel diameter. As a result, the locomotive's tractive effort was inferior to that of the Class 15CA which was introduced on the same line between Touws River and De Aar a year later.[1]
The locomotive was capable of speeds of 57 miles per hour (92 kilometres per hour), but it was found to be unsteady at high speed due to the absence of a leading bogie on each engine unit. It could handle a load of 1,245 long tons (1,265 tonnes) on 1 in 80 (1¼%) gradients and hauled 340 long tons (345 tonnes) up the 15 miles (24 kilometres) of 1 in 40 (2½%) gradient of the Hex River Railpass in sixty-two minutes without the help of the usual banking locomotive.[1][2]
Service
It was initially placed in service at Touws River and employed to work the Union Limited and Union Express fast passenger trains south of De Aar, but because of its unsteadiness at speed it was taken off fast passenger traffic and demoted to ordinary passenger and goods train working out of Cape Town. No more Class GG locomotives were ordered and since it was a non-standard locomotive, it was staged by 1938 and scrapped in 1947.[1][2][3]
Illustration
- No. 2290 as delivered, c. 1925
References
- ^ a b c d e f Holland, D. F. (1972). Steam Locomotives of the South African Railways. Vol. 2: 1910-1955 (1st ed.). Newton Abbott, England: David & Charles. pp. 47–49. ISBN 978-0-7153-5427-8.
- ^ 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.
- ^ a b c Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 92–93. ISBN 0869772112.
- ^ a b 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. 32.
- ^ a b 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. 32.
- ^ Hamilton, Gavin N., The Garratt Locomotive - Garratt Locomotives produced by Beyer, Peacock, retrieved 10 November 2012
- v
- t
- e
- SAR Class ES
- SAR Class ES1
- SAR Class Exp-AC
- SAR Class 1E
- SAR Class 2E
- SAR Class 3E
- SAR Class 4E
- SAR Class 5E s1
- SAR Class 5E s2
- SAR Class 5E s3
- SAR Class 5E1 s1
- SAR Class 5E1 s2
- SAR Class 5E1 s3
- SAR Class 5E1 s4
- SAR Class 5E1 s5
- SAR Class 6E
- SAR Class 6E1 s1
- SAR Class 6E1 s2
- SAR Class 6E1 s3
- SAR Class 6E1 s4
- SAR Class 6E1 s5
- SAR Class 6E1 s6
- SAR Class 6E1 s7
- SAR Class 6E1 s8
- SAR Class 6E1 s9
- SAR Class 6E1 s10
- SAR Class 6E1 s11
- SAR Class 7E
- SAR Class 7E1
- SAR Class 7E2 s1
- SAR Class 7E2 s2
- SAR Class 7E3 s1
- SAR Class 7E3 s2
- Spoornet Class 7E4
- SAR Class 8E
- SAR Class 9E s1
- SAR Class 9E s2
- SAR Class 10E
- SAR Class 10E1 s1
- Spoornet Class 10E1 s2
- SAR Class 10E2
- SAR Class 11E
- SAR Class 12E
- Spoornet Class 14E
- Spoornet Class 14E1
- TFR Class 15E
- Spoornet Class 16E
- Spoornet Class 17E
- Spoornet Class 18E s1
- TFR Class 18E s2
- TFR Class 19E
- TFR Class 20E
- TFR Class 21E
- TFR Class 22E
- TFR Class 23E