South African Class GG 2-6-2+2-6-2

GG no. 2290 at Cape Town, c. 1930

Type and origin
Power type	Steam
Designer	Beyer, Peacock and Company
Builder	Beyer, Peacock and Company
Serial number	6232
Model	Class GG
Build date	1925
Total produced	1

Specifications
Configuration	2-6-2+2-6-2 "Double Prairie" Garratt
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia	30 in (762 mm)
Driver diameter	57 in (1,448 mm)
Trailing dia	30 in (762 mm)
Wheelbase	Total: 67 ft 4 in (20,523 mm) Engines: 10 ft (3,048 mm) coupled 21 ft 4.5 in (6,515 mm) total
Length	74 ft 2.75 in (22,625 mm)
Height	12 ft 11.4375 in (3,948 mm)
Frame	Plate frame, 35 ft 4 in (10,770 mm) between pivot centres
Axle load	16.2 long tons (16.5 t) on 4th driver
Adhesive weight	94.5 long tons (96.0 t)
Loco weight	235,000 lb (106.6 t) empty 147.75 long tons (150.1 t) w/o
Fuel type	Coal
Fuel capacity	10 long tons (10.2 t)
Water cap	3,500 imp gal (16,000 l) front 1,100 imp gal (5,000 l) rear
Firebox: • Firegrate area	52 sq ft (4.831 m²)
Boiler	6 ft 9 in (2,057 mm) inside diameter 11 ft 8.625 in (3,572 mm) inside length 7 ft 9 in (2,362 mm) pitch
Boiler pressure	180 psi (1,240 kPa)
Heating surface	2,589 sq ft (240.526 m²)
• Tubes	288 tubes 2 in (51 mm) diameter 36 tubes 5.5 in (140 mm) diameter 2,374 sq ft (220.552 m²)
• Firebox	215 sq ft (19.974 m²)
Superheater: • Heating area	362 sq ft (33.631 m²)
Cylinders	Four
Cylinder size	18 in (457 mm) bore 26 in (660 mm) stroke
Valve gear	Walschaerts

Performance figures
Maximum speed	57 mph (92 km/h)
Tractive effort	39,900 lbf (177 kN) at 75% pressure

Career
Operators	South African Railways
Class	Class GG
Number in class	1
Numbers	2290
Delivered	1925
First run	1925
Withdrawn	1947

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The South African Railways Class GG 2-6-2+2-6-2 of 1925 is 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 main line passenger service.^[1]^[2]^[3]

Manufacturers

The Class GG 2-6-2+2-6-2 Double Prairie type Garratt locomotive was a development of the Class GB that was designed for the South African Railways (SAR) with large driving wheels for fast passenger service on main line duties. A single locomotive, number 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]

Characteristics

The Class GG had the largest driving 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, as required. It was, however, the only instance of this appliance being used on any SAR locomotive.^[1]

In order to keep costs down, the cylinders were not enlarged to compensate for the increased wheel diameter, with the result that its tractive effort was inferior to that of the Class 15CA that was introduced on the same line a year later.

It 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 gradients and hauled 340 long tons (345 tonnes) in sixty-two minutes up the 15 miles (24 kilometres) of 1 in 40 gradient of the Hex River Pass without the help of a banking locomotive.^[1]

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]^[3]

Illustration

The main picture and the following photograph offer views of both sides of the Class GG locomotive.

No. 2290 as delivered, c. 1925

References

1 2 3 4 5 Holland, D.F. (1972). Steam Locomotives of the South African Railways, Volume 2: 1910-1955 (1st ed.). Newton Abbott, Devon: David & Charles. pp. 47–49. ISBN 978-0-7153-5427-8.
↑ South African Railways and Harbours Locomotive Diagram Book, 2’0” & 3’6” Gauge Steam Locomotives, 15 August 1941, as amended
1 2 3 Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 92–93. ISBN 0869772112.
↑ Hamilton, Gavin N., The Garratt Locomotive - Garratt Locomotives produced by Beyer, Peacock, retrieved 10 November 2012

Wikimedia Commons has media related to South African Class GG (2-6-2+2-6-2).

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 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 Railmotor

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 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 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 Red Devil

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 Class Cape Copper Condenser Cape Copper Scotia Class 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 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

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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