South African Class 17 4-8-0TT

SAR Class 17 no. 1432, circa 1930

Type and origin
Power type	Steam
Designer	Natal Government Railways (William Milne)
Builder	Dübs and Company South African Railways
Serial number	See table
Model	SAR Class 17
Build date	1926-1929
Total produced	21

Specifications
Configuration	4-8-0TT (Mastodon)
Driver	2nd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	25 ³⁄₄ in (654 mm)
Coupled dia.	39 in (991 mm)
Tender wheels	34 in (864 mm)
Wheelbase	44 ft 11 ¹⁄₂ in (13,703 mm)
• Engine	19 ft 9 in (6,020 mm)
• Leading	5 ft (1,524 mm)
• Coupled	11 ft (3,353 mm)
• Tender	16 ft 1 in (4,902 mm)
• Tender bogie	4 ft 7 in (1,397 mm)
Length:
• Over couplers	52 ft 2 ¹⁄₂ in (15,913 mm)
Height	12 ft 2 ¹⁄₂ in (3,721 mm)
Axle load	8 LT 10 cwt (8,636 kg)
• Leading	9 LT 6 cwt (9,449 kg)
• 1st coupled	8 LT 2 cwt (8,230 kg)
• 2nd coupled	8 LT 10 cwt (8,636 kg)
• 3rd coupled	8 LT 3 cwt (8,281 kg)
• 4th coupled	8 LT 3 cwt (8,281 kg)
• Tender bogie	Bogie 1: 16 LT 15 cwt (17,020 kg) Bogie 2: 17 LT 18 cwt (18,190 kg)
Adhesive weight	32 LT 18 cwt (33,430 kg)
Loco weight	42 LT 4 cwt (42,880 kg)
Tender weight	34 LT 13 cwt (35,210 kg)
Total weight	76 LT 17 cwt (78,080 kg)
Tender type	2-axle bogies or 3-axle
Fuel type	Coal
Fuel capacity	5 LT 10 cwt (5.6 t)
Water cap	1,358 imp gal (6,170 l) engine
Tender cap	2,600 imp gal (11,800 l) tender
Firebox type	Belpaire
• Firegrate area	24 sq ft (2.2 m²)
Boiler:
• Pitch	7 ft (2,134 mm)
• Diameter	3 ft 10 ³⁄₄ in (1,187 mm)
• Tube plates	10 ft 10 ¹⁄₈ in (3,305 mm)
• Small tubes	187: 1 ³⁄₄ in (44 mm)
Boiler pressure	160 psi (1,103 kPa)
Safety valve	Ramsbottom
Heating surface	992 sq ft (92.2 m²)
• Tubes	930 sq ft (86 m²)
• Firebox	62 sq ft (5.8 m²)
Cylinders	Two
Cylinder size	17 in (432 mm) bore 21 in (533 mm) stroke
Valve gear	Stephenson
Couplers	Bell link-and-pin

Performance figures
Tractive effort	18,670 lbf (83.0 kN) @ 75%

Career
Operators	South African Railways
Class	Class 17
Number in class	21
Numbers	1415–1435
Delivered	1926-1929
First run	1926
Withdrawn	1961

The leading coupled axle had flangeless wheels

The South African Railways Class 17 4-8-0TT of 1926 was a steam locomotive from the pre-Union era in the Natal Colony.

Between 1926 and 1929, to address a shortage of suitable shunting locomotives, the South African Railways rebuilt twenty-one Class A 4-8-2T Mountain type tank steam locomotives to Class 17 4-8-0TT Mastodon type tank-and-tender locomotives.^[1]^[2]^[3]

Manufacturers

The Natal Government Railways (NGR) Class D 4-8-2T Mountain type tank locomotive was designed by William Milne, the locomotive superintendent of the NGR from 1877 to 1896, and built by Dübs and Company. One hundred of these locomotives were delivered in ten batches by Dübs between 1888 and 1899, and in 1915 another two were built from spare parts by the South African Railways (SAR) in their Durban shops.^[1]^[4]

Belpaire firebox

Beginning in 1905, these NGR Class D locomotives, originally known on the NGR as the "Dübs A", were gradually reboilered and fitted with Belpaire fireboxes with wider firegrates. The unmodified locomotives were then designated NGR Class D1, while the modified locomotives with Belpaire fireboxes were designated Class D2. In SAR service, the NGR Class D1 and D2 were both designated Class A in 1912, while the modified locomotives were referred to as Class A Belpaire.^[1]^[4]^[5]

Rebuilding

NGR Class D1 no. 105, c. 1900

When a shortage of suitable shunting locomotives developed in the 1920s, as a result of increasing traffic throughout the country and particularly on the Witwatersrand, the SAR modified twenty-one of the Class A Belpaire 4-8-2T Mountain type tank locomotives. The modifications were done between 1926 and 1929 and consisted of the removal of their trailing bissel bogies and coal bunkers, the shortening of their main frames and the addition of tenders to increase their coal and water capacity, thereby converting them to 4-8-0TT Mastodon type tank-and-tender locomotives.^[1]^[6]^[7]

Tenders from various scrapped locomotive types were used. The tender depicted in the main picture is a three-axle tender, while the official SAR locomotive diagram depicts a tender with four axles on two bogies. The bogie tenders which were used, were similar to those originally used with the Class 7E.^[1]^[2]^[3]

Service

These twenty-one rebuilt 4-8-2TT locomotives were reclassified to Class 17 and renumbered in the range from 1415 to 1435. They were employed as shunting engines around Durban and Port Elizabeth and were withdrawn from service by 1961, more than seventy years after the first one was built.^[3]^[7]

In November 1953, two of these locomotives, numbers 1423 and 1431, were purchased by the Zambezi Saw Mills Company, for use on their Livingstone-Mulobezi logging railway in Northern Rhodesia. They were scrapped between 1961 and 1963.

Works numbers and renumbering

**Class A Belpaire rebuilt to Class 17**
Class 17 No.	Year Built	NGR Class D2 No.	SAR Class A No.	Dübs Works No.
1415	1898	113	158	3556
1416	1897	108	154	3484
1417	1890	68	116	2611
1418	1899	134	190	3820
1419	1890	82	128	2625
1420	1890	75	122	2618
1421	1890	61	109	2604
1422	1895	89	135	3317
1423	1890	80	193	2626
1424	1898	120	166	3563
1425	1890	71	119	2614
1426	1895	90	136	3318
1427	1890	69	117	2612
1428	1890	70	118	2613
1429	1899	143	181	3829
1430	1899	141	191	3827
1431	1897	105	151	3481
1432	1898	112	157	3605
1433	1890	83	129	2623
1434	1897	101	147	3477
1435	1898	121	163	3564

References

1 2 3 4 5 Espitalier, T.J.; Day, W.A.J. (1944). The Locomotive in South Africa - A Brief History of Railway Development. Chapter III - Natal Government Railways. (Continued). South African Railways and Harbours Magazine, June 1944. p. 423.
1 2 South African Railways and Harbours Locomotive Diagram Book, 2'0" & 3'6" Gauge Steam Locomotives, 15 August 1941, pp. 21 & 21A, as amended
1 2 3 Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 10–11, 26–27, 68. ISBN 0869772112.
1 2 Holland, D.F. (1971). Steam Locomotives of the South African Railways, Volume 1: 1859-1910 (1st ed.). Newton Abbott, Devon: David & Charles. pp. 90–91. ISBN 978-0-7153-5382-0.
↑ The Railway Report for year ending 31 Dec. 1908, Natal Government Railways, p. 39, par 14.
↑ Whyte notation suffixes
1 2 Holland, D.F. (1972). Steam Locomotives of the South African Railways, Volume 2: 1910-1955 (1st ed.). Newton Abbott, Devon: David & Charles. p. 63. ISBN 978-0-7153-5427-8.

Wikimedia Commons has media related to South African Class 17 (4-8-0TT).

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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