South African Class MJ 2-6-6-0

Specifications
Specifications
Configuration:;
• Whyte	2-6-6-0 (Denver)
• UIC	(1'C)Chv4
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+3⁄4 in (1,086 mm)
Tender wheels	34 in (864 mm)
Wheelbase	58 ft 11+1⁄4 in (17,964 mm)
• Engine	32 ft 8 in (9,957 mm)
• Coupled	8 ft 4 in (2,540 mm) per unit
• Tender	16 ft 9 in (5,105 mm)
• Tender bogie	4 ft 7 in (1,397 mm)
Length:;
• Over couplers	67 ft 5+1⁄8 in (20,552 mm)
Height	♠♥ 12 ft 6+1⁄8 in (3,813 mm)
Frame type	Bar
Axle load	♠ 13 LT 15 cwt (13,970 kg)
• Leading	♠ 7 LT 17 cwt (7,976 kg)
• 1st coupled	♠ 12 LT 12 cwt (12,800 kg)
• 2nd coupled	♠ 12 LT 13 cwt (12,850 kg)
• 3rd coupled	♠ 12 LT 19 cwt (13,160 kg)
• 4th coupled	♠ 11 LT 8 cwt (11,580 kg)
• 5th coupled	♠ 12 LT 16 cwt (13,010 kg)
• 6th coupled	♠ 13 LT 15 cwt (13,970 kg)
• Tender bogie	Bogie 1: 27 LT 10 cwt (27,940 kg); Bogie 2: 23 LT 11 cwt (23,930 kg)
• Tender axle	13 LT 15 cwt (13,970 kg)
Adhesive weight	♠ 76 LT 3 cwt (77,370 kg)
Loco weight	♠ 84 LT (85,350 kg)
Tender weight	51 LT 1 cwt (51,870 kg)
Total weight	♠ 135 LT 1 cwt (137,200 kg)
Tender type	MP1 (2-axle bogies); MP, MP1, MR permitted
Fuel type	Coal
Fuel capacity	10 LT (10.2 t)
Water cap.	4,250 imp gal (19,300 L)
Firebox:
• Type	♠♥ Belpaire
• Grate area	♠♥ 40 sq ft (3.7 m2)
Boiler:;
• Pitch	♠♥ 7 ft 9+1⁄8 in (2,365 mm)
• Diameter	♠♥ 5 ft 1+1⁄2 in (1,562 mm)
• Tube plates	♠ 17 ft (5,182 mm); ♥ 17 ft 1⁄4 in (5,188 mm)
• Small tubes	♠♥ 151: 2 in (51 mm)
• Large tubes	♠♥ 18 5+1⁄2 in (140 mm)
Boiler pressure	♠♥ 200 psi (1,379 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	♠ 130 sq ft (12 m2); ♥ 133 sq ft (12.4 m2)
• Tubes	♠ 1,783 sq ft (165.6 m2); ♥ 1,780 sq ft (165 m2)
• Total surface	♠♥ 1,913 sq ft (177.7 m2)
Superheater:;
• Type	Schmidt
• Heating area	♠ 343 sq ft (31.9 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	Johnston link-and-pin; AAR knuckle (1930s)

Type and origin
Type and origin
	♠ Locomotive as built - ♥ Reboilered locomotive
Power type	Steam
Designer	South African Railways; (D.A. Hendrie)
Builder	Maffei; North British Locomotive Company
Order number	NBL L657
Serial number	Maffei 3452-3461; NBL 21248-21255
Model	SAR Class MJ
Build date	1914
Total produced	18

South African Class MJ 2-6-6-0
South African Class MJ 2-6-6-0
	SAR Class MJ no. 1651, c. 1914
Power type
Type and origin
	♠ Locomotive as built - ♥ Reboilered locomotive
Power type	Steam
Designer	South African Railways; (D.A. Hendrie)
Builder	Maffei; North British Locomotive Company
Order number	NBL L657
Serial number	Maffei 3452-3461; NBL 21248-21255
Model	SAR Class MJ
Build date	1914
Total produced	18
Configuration:;
Specifications
Configuration:;
• Whyte	2-6-6-0 (Denver)
• UIC	(1'C)Chv4
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+3⁄4 in (1,086 mm)
Tender wheels	34 in (864 mm)
Wheelbase	58 ft 11+1⁄4 in (17,964 mm)
• Engine	32 ft 8 in (9,957 mm)
• Coupled	8 ft 4 in (2,540 mm) per unit
• Tender	16 ft 9 in (5,105 mm)
• Tender bogie	4 ft 7 in (1,397 mm)
Length:;
• Over couplers	67 ft 5+1⁄8 in (20,552 mm)
Height	♠♥ 12 ft 6+1⁄8 in (3,813 mm)
Frame type	Bar
Axle load	♠ 13 LT 15 cwt (13,970 kg)
• Leading	♠ 7 LT 17 cwt (7,976 kg)
• 1st coupled	♠ 12 LT 12 cwt (12,800 kg)
• 2nd coupled	♠ 12 LT 13 cwt (12,850 kg)
• 3rd coupled	♠ 12 LT 19 cwt (13,160 kg)
• 4th coupled	♠ 11 LT 8 cwt (11,580 kg)
• 5th coupled	♠ 12 LT 16 cwt (13,010 kg)
• 6th coupled	♠ 13 LT 15 cwt (13,970 kg)
• Tender bogie	Bogie 1: 27 LT 10 cwt (27,940 kg); Bogie 2: 23 LT 11 cwt (23,930 kg)
• Tender axle	13 LT 15 cwt (13,970 kg)
Adhesive weight	♠ 76 LT 3 cwt (77,370 kg)
Loco weight	♠ 84 LT (85,350 kg)
Tender weight	51 LT 1 cwt (51,870 kg)
Total weight	♠ 135 LT 1 cwt (137,200 kg)
Tender type	MP1 (2-axle bogies); MP, MP1, MR permitted
Fuel type	Coal
Fuel capacity	10 LT (10.2 t)
Water cap.	4,250 imp gal (19,300 L)
Firebox:
• Type	♠♥ Belpaire
• Grate area	♠♥ 40 sq ft (3.7 m2)
Boiler:;
• Pitch	♠♥ 7 ft 9+1⁄8 in (2,365 mm)
• Diameter	♠♥ 5 ft 1+1⁄2 in (1,562 mm)
• Tube plates	♠ 17 ft (5,182 mm); ♥ 17 ft 1⁄4 in (5,188 mm)
• Small tubes	♠♥ 151: 2 in (51 mm)
• Large tubes	♠♥ 18 5+1⁄2 in (140 mm)
Boiler pressure	♠♥ 200 psi (1,379 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	♠ 130 sq ft (12 m2); ♥ 133 sq ft (12.4 m2)
• Tubes	♠ 1,783 sq ft (165.6 m2); ♥ 1,780 sq ft (165 m2)
• Total surface	♠♥ 1,913 sq ft (177.7 m2)
Superheater:;
• Type	Schmidt
• Heating area	♠ 343 sq ft (31.9 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	Johnston link-and-pin; AAR knuckle (1930s)
Tractive effort
Performance figures
Tractive effort	♠ 38,170 lbf (169.8 kN) @ 50%; ♥ 37,950 lbf (168.8 kN) @ 50%
Operators
Career
Operators	South African Railways
Class	Class MJ
Number in class	18
Numbers	1651-1660, 1674-1681
Delivered	1914-1921
First run	1914
Scrapped	1962

The South African Railways Class MJ 2-6-6-0 of 1914 was a class of articulated steam locomotives.

Between 1914 and 1921, the South African Railways placed eighteen Class MJ Mallet articulated compound steam locomotives with a 2-6-6-0 wheel arrangement in branch line service.^[1]^[2]^[3]^[4]

^ Holland, D. F. (1972). Steam Locomotives of the South African Railways. Vol. 2: 1910-1955 (1st ed.). Newton Abbott, England: David & Charles. p. 29. ISBN 978-0-7153-5427-8.
^ 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. pp. 349-350.
^ South African Railways and Harbours Locomotive Diagram Book, 2’0” & 3’6” Gauge Steam Locomotives, 15 August 1941, as amended
^ Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 87–88. ISBN 0869772112.

[Holland_2-1] Holland, D. F. (1972). Steam Locomotives of the South African Railways. Vol. 2: 1910-1955 (1st ed.). Newton Abbott, England: David & Charles. p. 29. ISBN 978-0-7153-5427-8.

[SAR&H_May_1945-2] 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. pp. 349-350.

[diagram-book-3] South African Railways and Harbours Locomotive Diagram Book, 2’0” & 3’6” Gauge Steam Locomotives, 15 August 1941, as amended

[Paxton-Bourne-4] Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 87–88. ISBN 0869772112.

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