South African Class MJ1 2-6-6-0

SAR Class MJ1 no. 1673, c. 1920

Type and origin
♠ Locomotive as built - ♥ Reboilered locomotive
Power type	Steam
Designer	South African Railways Montreal Locomotive Works
Builder	Montreal Locomotive Works
Serial number	58427-58434
Model	SAR Class MJ1
Build date	1918
Total produced	8

Specifications
Configuration	2-6-6-0 (Denver)
Driver	3rd & 6th coupled axles
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	28 ¹⁄₂ in (724 mm)
Coupled dia.	42 ¹⁄₂ in (1,080 mm) as built 42 ³⁄₄ in (1,086 mm) retyred
Tender wheels	34 in (864 mm)
Wheelbase	60 ft 8 ¹⁄₄ in (18,498 mm)
• Engine	32 ft 8 in (9,957 mm)
• Coupled	8 ft 4 in (2,540 mm) per unit
• Tender	17 ft 11 in (5,461 mm)
• Tender bogie	4 ft 7 in (1,397 mm)
Length:
• Over couplers	68 ft 7 ¹⁄₈ in (20,907 mm)
Height	♠♥ 12 ft 6 ¹⁄₈ in (3,813 mm)
Frame type	Bar
Axle load	♠ 14 LT 2 cwt (14,330 kg)
• Leading	♠ 7 LT 10 cwt (7,620 kg)
• 1st coupled	♠ 13 LT 13 cwt (13,870 kg)
• 2nd coupled	♠ 13 LT 15 cwt (13,970 kg)
• 3rd coupled	♠ 14 LT 2 cwt (14,330 kg)
• 4th coupled	♠ 12 LT 11 cwt (12,750 kg)
• 5th coupled	♠ 13 LT 12 cwt (13,820 kg)
• 6th coupled	♠ 13 LT 7 cwt (13,560 kg)
• Tender axle	12 LT 14 cwt 2 qtr (12,930 kg) av.
Adhesive weight	♠ 81 LT (82,300 kg)
Loco weight	♠ 88 LT 10 cwt (89,920 kg) w/o
Tender weight	50 LT 18 cwt (51,720 kg) w/o
Total weight	♠ 139 LT 8 cwt (141,600 kg) w/o
Tender type	LP (2-axle bogies)
Fuel type	Coal
Fuel capacity	10 LT (10.2 t)
Water cap	4,250 imp gal (19,300 l)
Firebox type	Belpaire
• Firegrate area	♠♥ 40 sq ft (3.7 m²)
Boiler:
• Pitch	♠♥ 7 ft 9 ¹⁄₈ in (2,365 mm)
• Diameter	♠ 5 ft 2 ³⁄₄ in (1,594 mm) ♥ 5 ft 1 ¹⁄₂ in (1,562 mm)
• Tube plates	♠ 17 ft ³⁄₈ in (5,191 mm) ♥ 17 ft ¹⁄₄ in (5,188 mm)
• Small tubes	♠ 146: 2 in (51 mm) ♥ 151: 2 in (51 mm)
• Large tubes	♠ 22: 5 ³⁄₈ in (137 mm) ♥ 18: 5 ¹⁄₂ in (140 mm)
Boiler pressure	♠♥ 200 psi (1,379 kPa)
Safety valve	Ramsbottom
Heating surface	♠ 2,042 sq ft (189.7 m²) ♥ 1,913 sq ft (177.7 m²)
• Tubes	♠ 1,906 sq ft (177.1 m²) ♥ 1,780 sq ft (165 m²)
• Firebox	♠ 136 sq ft (12.6 m²) ♥ 133 sq ft (12.4 m²)
Superheater:
• Type	♠♥ Schmidt
• Heating area	♠ 413 sq ft (38.4 m²) ♥ 350 sq ft (33 m²)
Cylinders	Four
High-pressure cylinder	16 ¹⁄₂ in (419 mm) bore 24 in (610 mm) stroke
Low-pressure cylinder	26 in (660 mm) bore 24 in (610 mm) stroke
Valve gear	Walschaerts
Valve type	Piston
Couplers	Bell link-and-pin AAR knuckle (1950s)

Performance figures
Tractive effort	♠ 38,170 lbf (169.8 kN) @ 50% ♥ 37,950 lbf (168.8 kN) @ 50%

Career
Operators	South African Railways
Class	Class MJ1
Number in class	8
Numbers	1666-1673
Delivered	1918
First run	1918
Withdrawn	c. 1960

The South African Railways Class MJ1 2-6-6-0 of 1918 was a steam locomotive.

In 1918, the South African Railways placed eight Class MJ1 Mallet articulated compound steam locomotives with a 2-6-6-0 wheel arrangement in branchline service.^[1]^[2]^[3]^[4]

Manufacturer

Because of the difficulties experienced by the usual British and German suppliers to build new locomotives during the First World War, orders for the Class MJ1 2-6-6-0 Mallet articulated compound steam locomotive were placed with Montreal Locomotive Works (MLW) in Canada. The locomotive was designed by MLW, based on the specifications for the Class MJ Mallet which was designed by D.A. Hendrie, the Chief Mechanical Engineer (CME) of the South African Railways (SAR) from 1910 to 1922. Eight of these branchline locomotives were built and delivered by MLW in November 1918, numbered in the range from 1666 to 1673.^[1]^[2]^[4]

Characteristics

The locomotives were superheated, had Walschaerts valve gear and, like the Class MJ Mallets, had Belpaire fireboxes, but slightly larger boilers. When compared to the Class MJ, a distinguishing feature of the Class MJ1 was the sandbox, which was mounted on top of the boiler in North American style, to the rear of the steam dome. In general appearance, they bore a family resemblance to the Class 14C and Class 15B 4-8-2 locomotives, which were also built by MLW in 1918.^[1]^[2]^[4]

During 1922, the coupled wheels were retyred and their diameter was increased from 42 ¹⁄₂ inches (1,080 millimetres) to 42 ³⁄₄ inches (1,086 millimetres).^[2]

Reboilering

During 1939, while W.A.J. Day was the CME of the SAR, the Classes MJ and MJ1 were modified slightly, to be reboilered with the same standard boiler.^[2]

Service

The Class MJ1 was the last Mallet locomotive class to be placed in service by the SAR. All its subsequent new articulated locomotives were to be Modified Fairlies, Garratts and Union Garratts.^[5]

The Class MJ1 was also intended for branchline working and joined the Class MJ Mallets in service in the Eastern Cape. All eight were still in service by March 1948, but they were all withdrawn from service by 1960.^[1]^[4]^[5]

Illustration

No. 1668 at Butterworth, Eastern Cape, c. 1950

References

1 2 3 4 Holland, D.F. (1972). Steam Locomotives of the South African Railways, Volume 2: 1910-1955 (1st ed.). Newton Abbott, Devon: David & Charles. pp. 36–37. ISBN 978-0-7153-5427-8.
1 2 3 4 5 Espitalier, T.J.; Day, W.A.J. (1945). The Locomotive in South Africa - A Brief History of Railway Development. Chapter VII - South African Railways (Continued). South African Railways and Harbours Magazine, May 1945. p. 350.
↑ South African Railways and Harbours Locomotive Diagram Book, 2’0” & 3’6” Gauge Steam Locomotives, 15 August 1941, as amended
1 2 3 4 Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. p. 88. ISBN 0869772112.
1 2 Durrant, A E (1989). Twilight of South African Steam (1st ed.). Newton Abbott, London: David & Charles. pp. 24–25. ISBN 0715386387.

Wikimedia Commons has media related to South African Class MJ1 (2-6-6-0).

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 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 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

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 Joy 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 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 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

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 Cape Copper Condenser Cape Copper Scotia 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 Dutton 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

Gas-electric

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 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

South African steam locomotive tenders

Cape gauge	Type LP Type MP1 Type MR Type SH Type SK Type TJ Type TL Type TM Type WE Type WG Type XC Type XC1 Type XD Type XE Type XE1 Type XF Type XF2 Type XJ Type XM Type XM1 Type XM2 Type XM3 Type XM4 Type XP1 Type XS Type YB Type YC Type YE Type YE1 Type ZA Type ZB Type ZC Type ZE

List of South African locomotive classes South African locomotive history

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