South African Class MJ1 2-6-6-0
300px
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 axle |
3rd & 6th coupled axles |
Gauge |
3 ft 6 in (1,067 mm) Cape gauge |
Leading dia |
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Coupled dia |
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Lua error in Module:Convert at line 452: attempt to index field 'titles' (a nil value). retyred |
Tender wheels |
34 in (864 mm) |
Wheelbase |
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• 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 |
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Height |
♠♥ Lua error in Module:Convert at line 452: attempt to index field 'titles' (a nil value). |
Frame type |
Bar |
Axle load |
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• Leading |
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• 1st coupled |
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• 2nd coupled |
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• 3rd coupled |
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• 4th coupled |
♠ Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). |
• 5th coupled |
♠ Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). |
• 6th coupled |
♠ Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). |
• Tender axle |
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Adhesive weight |
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Loco weight |
♠ Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). w/o |
Tender weight |
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Loco & tender weight |
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Tender type |
LP (2-axle bogies) |
Fuel type |
Coal |
Fuel capacity |
10 LT (10.2 t) |
Water cap |
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Boiler:
• Pitch |
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• Diameter |
♠ Lua error in Module:Convert at line 452: attempt to index field 'titles' (a nil value).
♥ Lua error in Module:Convert at line 452: attempt to index field 'titles' (a nil value). |
• Tube plates |
♠ Lua error in Module:Convert at line 452: attempt to index field 'titles' (a nil value).
♥ Lua error in Module:Convert at line 452: attempt to index field 'titles' (a nil value). |
• Small tubes |
♠ 146: 2 in (51 mm)
♥ 151: 2 in (51 mm) |
• large tubes |
♠ 22: Lua error in Module:Convert at line 452: attempt to index field 'titles' (a nil value).
♥ 18: Lua error in Module:Convert at line 452: attempt to index field 'titles' (a nil value). |
• Firebox type |
Belpaire |
Boiler pressure |
♠♥ 200 psi (1,379 kPa) |
Safety valve |
Ramsbottom |
Firegrate area |
♠♥ 40 sq ft (3.7 m2) |
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 |
♠♥ Schmidt |
• Heating area |
♠ 413 sq ft (38.4 m2)
♥ 350 sq ft (33 m2) |
Cylinders |
Four |
High-pressure
cylinder size |
Lua error in Module:Convert at line 452: attempt to index field 'titles' (a nil value). bore
24 in (610 mm) stroke |
Low-pressure
cylinder size |
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 Lua error in Module:Convert at line 452: attempt to index field 'titles' (a nil value). to Lua error in Module:Convert at line 452: attempt to index field 'titles' (a nil value)..[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
-
Class MJ1 no. 1668.jpg
No. 1668 at Butterworth, Eastern Cape, c. 1950
References
- ↑ 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 2.4 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
- ↑ 4.0 4.1 4.2 4.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.