South African Class NG G13 2-6-2+2-6-2

NG G13 no. 49 at Sandstone Estates, 9 April 2006

Type and origin
Power type	Steam
Designer	Hannoversche Maschinenbau AG
Builder	Hannoversche Maschinenbau AG
Serial number	10549-10551, 10598-10599, 10629-10635
Model	Class NG G13
Build date	1927-1928
Total produced	12

Specifications
Configuration	2-6-2+2-6-2 (Double Prairie)
Driver	3rd & 4th coupled axles
Gauge	2 ft (610 mm) narrow
Leading dia.	21 in (533 mm)
Coupled dia.	33 in (838 mm)
Trailing dia.	21 in (533 mm)
Minimum curve	150 ft (46 m)
Wheelbase	42 ft 9 in (13,030 mm)
• Engine	13 ft 2 in (4,013 mm) each
• Coupled	6 ft 3 in (1,905 mm) each
Pivot centres	23 ft 9 in (7,239 mm)
Length:
• Over couplers	48 ft 5 ¹⁄₄ in (14,764 mm)
Height	10 ft 4 in (3,150 mm)
Frame type	Bar
Axle load	7 LT 1 cwt 2 qtr (7,189 kg)
• Leading	6 LT 10 cwt 1 qtr (6,617 kg) front 6 LT 1 cwt 1 qtr (6,160 kg) rear
• 1st coupled	7 LT 1 cwt 2 qtr (7,189 kg)
• 2nd coupled	6 LT 18 cwt 1 qtr (7,023 kg)
• 3rd coupled	6 LT 14 cwt (6,808 kg)
• 4th coupled	6 LT 16 cwt 1 qtr (6,922 kg)
• 5th coupled	6 LT 17 cwt 3 qtr (6,998 kg)
• 6th coupled	6 LT 13 cwt 2 qtr (6,782 kg)
• Trailing	4 LT 0 cwt 2 qtr (4,090 kg) front 4 LT (4,064 kg) rear
Adhesive weight	41 LT 1 cwt 1 qtr (41,720 kg)
Loco weight	61 LT 13 cwt 1 qtr (62,650 kg)
Fuel type	Coal
Fuel capacity	4 LT (4.1 t)
Water cap	1,285 imp gal (5,840 l) front 540 imp gal (2,450 l) rear
Firebox type	Round-top
• Firegrate area	19.5 sq ft (1.81 m²)
Boiler:
• Pitch	5 ft 5 in (1,651 mm)
• Diameter	4 ft 7 ³⁄₄ in (1,416 mm)
• Tube plates	9 ft 3 ⁵⁄₈ in (2,835 mm)
• Small tubes	152: 1 ³⁄₄ in (44 mm)
• Large tubes	15: 5 ¹⁄₂ in (140 mm)
Boiler pressure	180 psi (1,241 kPa)
Safety valve	Pop
Heating surface	921.1 sq ft (85.57 m²)
• Tubes	839 sq ft (77.9 m²)
• Firebox	82.1 sq ft (7.63 m²)
Superheater:
• Heating area	149 sq ft (13.8 m²)
Cylinders	Four
Cylinder size	12 in (305 mm) bore 16 in (406 mm) stroke
Valve gear	Walschaerts
Valve type	Piston
Couplers	Bell link-and-pin (Natal) Bell lift-hook (Cape)

Performance figures
Tractive effort	18,850 lbf (83.8 kN) @ 75%

Career
Operators	South African Railways
Class	Class NG G13
Number in class	12
Numbers	49-50, 58-60, 77-83
Delivered	1927-1929
First run	1927
Withdrawn	1973

The South African Railways Class NG G13 2-6-2+2-6-2 of 1927 was a narrow gauge articulated steam locomotive.

Between 1927 and 1929, the South African Railways placed twelve Class NG G13 Garratt articulated steam locomotives with a 2-6-2+2-6-2 Double Prairie type wheel arrangement in service on the Langkloof and Alfred County Railway narrow gauge lines.^[1]^[2]^[3]

Manufacturer

In 1927, Hannoversche Maschinenbau AG (Hanomag), in consultation with the South African Railways (SAR), designed a locomotive which was to become the standard 2 feet (610 millimetres) narrow gauge Garratt locomotive in South Africa for the next forty years. It was greatly improved from the Class NG G11, with trailing wheels added to each engine unit, outside bar frames instead of plate frames, round-topped fireboxes instead of Belpaire fireboxes, and larger dimensions in most respects except the grate area.^[2]^[3]^[4]

The initial order was for three Class NG G13 locomotives, numbered in the range from NG58 to NG60, which were delivered and placed in service in November 1927. These locomotives were superheated and sported an extremely compact arrangement of Walschaerts valve gear and outside bar frames. The leading wheels were arranged as conventional pony trucks, while the inner carrying wheels were built to the Gölsdorf system, which allowed the axle some lateral movement.^[1]^[2]^[5]

Performance trials of the Class NG G13 proved it to be both powerful and free steaming, despite having a smaller grate area than the predecessor Class NG G11. This resulted in an immediate order for another two locomotives, numbers NG49 and NG50, and even before these were delivered, another seven, numbered in the range from NG77 to NG83. The second and third orders were both delivered in 1928, with the third order locomotives entering service during January 1929.^[1]^[2]

Service

The introduction of articulated locomotives on the 2 ft (610 mm) narrow gauge branches gave this gauge a new lease of life and made it easier to withstand the agitation from some quarters to convert these branches to Cape gauge. Apart from appreciable economies in working, they enabled train loads and the carrying capacity of the narrow gauge lines to be virtually doubled, without the need to strengthen track and bridges.^[2]

Natal

The first five locomotives, numbers NG49, NG50 and NG58 to NG60, were used almost exclusively on the narrow gauge lines in Natal. Some of these routes had curves of 45 metres (148 feet) radius and gradients of up to 3 in 100 (3%), but the Garratts were well suited to hauling the diverse freight traffic of pulpwood, sugar cane and bananas.^[6]

One of these lines, the 122 kilometres (76 miles) branchline from Port Shepstone to Paddock via Izotsha, was eventually privatised as the Port Shepstone and Alfred County Railway (ACR) after the SAR ceased operations there in 1986. The ACR conducted both freight and tourist passenger operations, with the tourist train becoming known as the Banana Express.^[6]

Cape Province

The third order of seven locomotives, numbers NG77 to NG83, initially all went to the Avontuur line, where most of them remained for their entire service lives. In 1965, numbers NG77 and NG78 were exchanged for two Class NG G11 locomotives, numbers NG54 and NG55, from the Natal system. The Avontuur locomotives ended their service lives working out of Loerie, either hauling limestone trains to Van Stadens or doing duty on the Patensie branchline.^[1]

The 283 kilometres (176 miles) Avontuur line stretches from Port Elizabeth to Avontuur through the Langkloof. The narrow gauge track enabled the trains to pick up fruit virtually directly from the Langkloof fruit farms and ship it directly, without reloading, to the ripening warehouses, distributors and ships at Port Elizabeth. The route became known as the Apple Express after the main crop it transported. The line also carried pulpwood, as well as limestone to supply the cement factories which were located on the route.^[6]

Retirement

When the lower section of the Avontuur line was dieselised upon the arrival of the Class 91-000 diesel-electric locomotives in 1973, the Class NG G13 locomotives were all withdrawn from service. Beginning at about the same time, the Natal locomotives were also progressively withdrawn from service.^[1]

Preservation

Since withdrawal from SAR service, some locomotives were sold into private hands, while others ended up in various degrees of preservation, ranging across the spectrum from operational to plinthing to total abandonment. One known ex SAR Class NG G13 Garratt, no. NG49 serving at the Sandstone Estates near Ficksburg, is being kept in excellent running order. Two were plinthed, no. NG80 at Joubertina station and no. NG81 at Patensie station. No. NG50 was restored and has been operational from 15 November 2015, at the Hempstead and Northern Railroad in Hempstead, Texas.

The last known locations of all the Class NG G13 locomotives are shown in the table.^[7]

South African Class NG G13 2-6-2+2-6-2
Locations as at c. 2009


Number	Works No.	Country	Location	Notes
NG49	10599/1928	South Africa	Sandstone Estates	Operational
NG50	10598/1928	United States	Hempstead, Texas	Operational from 15 November 2015 at the Hempstead and Northern Railroad in Hempstead, Texas
NG58	10549/1927	South Africa	SANRASM, Krugersdorp	First NG G13 delivered to SAR
NG59	10550/1927	South Africa	Scrapped	Wrecked after rolling over in an accident on the Weenen to Escourt line in the early 1980s
NG60	10551/1927	Switzerland	Schinznach-Dorf	Stored operational, due to track radius issues. (expected to move to a location where it can operate during 2016)
NG77	10629/1928	England	Exmoor Steam Ry. ^[8]	In store at Bratton Fleming, previously resided at the Brecon Mountain Railway in Wales. Is 95% complete, boiler overhauled, needs mainly copper pipework to complete. May steam locally in the future. Privately owned by Trevor & June Stirland.
NG78	10630/1928	Germany	Berlin	German Museum of Technology since May 1988, carries works- and number plates for no. NG83 ^[9]
NG79	10631/1928	South Africa	Scrapped	Roofed over, but still open to the elements at Humewood Road for many years ^[9]
NG80	10632/1928	South Africa	Joubertina station	Plinthed
NG81	10633/1928	South Africa	Patensie station	Plinthed
NG82	10634/1928	England	Phyllis Rampton Trust	In store at a private site in Surrey. Previously resided at the Brecon Mountain Railway
NG83	10635/1928	Germany	Emmerich	Stored operational. Fully overhauled at Meiningen by 1996 and fitted with a new boiler. Privately owned by Dr. Muhr since May 1988.^[9]

Illustration

No. NG58, the first Class NG G13 to be delivered, c. 1927
Class NG G13 on a passenger train at Port Elizabeth, c. 1940
No. NG81 plinthed at Patensie station, 8 April 1985
No. NG50 in steam in Hempstead, Texas, 15 November 2015

References

1 2 3 4 5 Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 10–11, 107. ISBN 0869772112.
1 2 3 4 5 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, February 1946. p. 135.
1 2 Durrant, A E (1989). Twilight of South African Steam (1st ed.). Newton Abbott, London: David & Charles. p. 124. ISBN 0715386387.
↑ Hamilton, Gavin N., The Garratt Locomotive - Garratt Locomotives from Other Builders, retrieved 10 November 2012
↑ South African Railways and Harbours Locomotive Diagram Book, 2'0" & 3'6" Gauge Steam Locomotives, 15 August 1941, as amended
1 2 3 "South Africa Rail Offering". The New York Times. 1988-03-28. Retrieved 2010-05-23.
↑ Middleton, John N. (2002). Railways of Southern Africa Locomotive Guide - 2002 (as amended by Combined Amendment List 4, January 2009) (2nd, Dec 2002 ed.). Herts, England: Beyer-Garratt Publications. p. 31.
↑ Exmoor Steam Railway and its history
1 2 3 Stars of Sandstone 2017 (sic: 2015) - Newsletter Number III, p. 4

Wikimedia Commons has media related to South African Class NG G13 (2-6-2+2-6-2).

Locomotives of South Africa

Steam

7' ¼" gauge	East London 0-4-0VB Table Bay 0-4-0ST Table Bay 0-4-0T Table Bay 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 CGR 0-4-0ST 1881 Coffee Pot CGR 0-6-0ST CGR 0-6-0T 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 CGR 1st Class 4-4-0T CGR 2nd Class 4-4-0T CGR 3rd Class 2-6-0T CGR Railmotor CSAR Class C CSAR Class E CSAR Rack 4-6-4RT CSAR Railmotor Durban's Congella Durban's Edward Innes Durban's John Milne Durban's Sir Albert Port Elizabeth 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 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 Railmotor SAR Dock 0-4-0ST SAR Dock 0-4-0T SWA 2-8-0T

3' 6" gauge Tender engines	CGR 1st Class 2-6-0 1876 BP 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 CGR 1st Class 4-4-0TT CGR 2nd Class 2-6-2TT 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 1882 Joy CGR 4th Class 4-6-0TT 1884 CGR 5th Class 4-6-0 1890 CGR 5th Class 4-6-0 1891 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 1928 SAR Class 16DA 1930 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 SWA 2-8-0

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 John King & Miner Cape Copper Britannia Cape Copper Caledonia Cape Copper Clara Cape Copper Condenser Cape Copper Scotia Namaqua Copper Pioneer Walvis Bay 2-4-2T Hope

2' & 600mm gauges	ACR Class NG-G16A CGR NG 0-4-0T CGR NG 0-6-0T CGR NG 4-6-2T CGR Type A 2-6-4T CGR Type C 0-4-0T NGR Class N 4-6-2T SAR Dutton SAR NG 0-4-0T 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 SWA Class Ha SWA Class Hb SWA Class Hc SWA Class Hd SWA Jung SWA Zwillinge

Electric

Amcoal Class E38

Gas-electric

SAR 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 TFR Class 35-800 SAR Class 36-000 SAR Class 36-200 SAR Class 37-000 Spoornet Class 39-000 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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