South African Class MA 2-6-6-0

Specifications
Specifications
Configuration:;
• Whyte	2-6-6-0 (Denver)
• UIC	(1'C)Cnv4
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.	45+1⁄2 in (1,156 mm)
Tender wheels	30 in (762 mm)
Wheelbase	60 ft 2+3⁄4 in (18,358 mm)
• Engine	33 ft 2 in (10,109 mm)
• Coupled	8 ft 4 in (2,540 mm) per unit
• Tender	17 ft 10 in (5,436 mm)
• Tender bogie	5 ft 10 in (1,778 mm)
Length:;
• Over couplers	68 ft 2+3⁄8 in (20,787 mm)
Height	12 ft 5+1⁄8 in (3,788 mm)
Frame type	Bar
Axle load	13 LT 18 cwt (14,120 kg)
• Leading	6 LT 17 cwt (6,960 kg)
• 1st coupled	12 LT 14 cwt (12,900 kg)
• 2nd coupled	13 LT 18 cwt (14,120 kg)
• 3rd coupled	13 LT 6 cwt 2 qtr (13,540 kg)
• 4th coupled	13 LT 2 cwt (13,310 kg)
• 5th coupled	12 LT 18 cwt (13,110 kg)
• 6th coupled	13 LT 16 cwt (14,020 kg)
• Tender bogie	Bogie 1: 20 LT 7 cwt (20,680 kg); Bogie 2: 22 LT 10 cwt (22,860 kg)
Adhesive weight	79 LT 14 cwt 2 qtr (81,000 kg)
Loco weight	86 LT 11 cwt 2 qtr (87,960 kg)
Tender weight	42 LT 17 cwt (43,540 kg)
Total weight	129 LT 8 cwt 2 qtr (131,500 kg)
Tender type	2-axle bogies
Fuel type	Coal
Fuel capacity	8 LT 5 cwt (8.4 t)
Water cap.	4,000 imp gal (18,000 L)
Firebox:
• Type	Round-top & combustion chamber
• Grate area	40 sq ft (3.7 m2)
Boiler:;
• Pitch	7 ft 4 in (2,235 mm)
• Diameter	5 ft 4 in (1,626 mm)
• Tube plates	17 ft 10+1⁄2 in (5,448 mm)
• Small tubes	230: 2+1⁄4 in (57 mm)
Boiler pressure	200 psi (1,379 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	125 sq ft (11.6 m2)
• Tubes	2,422 sq ft (225.0 m2)
• Total surface	2,574 sq ft (239.1 m2)
Cylinders	Four
High-pressure cylinder	17+1⁄2 in (444 mm) bore; 26 in (660 mm) stroke
Low-pressure cylinder	28 in (711 mm) bore; 26 in (660 mm) stroke
Valve gear	Walschaerts
Valve type	HP: Piston; LP: Richardson balanced slide
Valve travel	HP: 5 in (127 mm); LP: 5+1⁄2 in (140 mm)
Valve lap	HP: 1 in (25 mm); LP: 7⁄8 in (22 mm)
Valve lead	HP & LP: 3⁄16 in (5 mm)
Couplers	Johnston link-and-pin

Type and origin
Type and origin
Power type	Steam
Designer	American Locomotive Company
Builder	American Locomotive Company
Serial number	46044
Model	NGR Mallet
Build date	1909
Total produced	1

NGR Mallet 2-6-6-0 1909
South African Class MA 2-6-6-0
NGR Mallet 2-6-6-0 1909; South African Class MA 2-6-6-0
	NGR Mallet no. 336, SAR Class MA no. 1601, c. 1909
Power type
Type and origin
Power type	Steam
Designer	American Locomotive Company
Builder	American Locomotive Company
Serial number	46044
Model	NGR Mallet
Build date	1909
Total produced	1
Configuration:;
Specifications
Configuration:;
• Whyte	2-6-6-0 (Denver)
• UIC	(1'C)Cnv4
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.	45+1⁄2 in (1,156 mm)
Tender wheels	30 in (762 mm)
Wheelbase	60 ft 2+3⁄4 in (18,358 mm)
• Engine	33 ft 2 in (10,109 mm)
• Coupled	8 ft 4 in (2,540 mm) per unit
• Tender	17 ft 10 in (5,436 mm)
• Tender bogie	5 ft 10 in (1,778 mm)
Length:;
• Over couplers	68 ft 2+3⁄8 in (20,787 mm)
Height	12 ft 5+1⁄8 in (3,788 mm)
Frame type	Bar
Axle load	13 LT 18 cwt (14,120 kg)
• Leading	6 LT 17 cwt (6,960 kg)
• 1st coupled	12 LT 14 cwt (12,900 kg)
• 2nd coupled	13 LT 18 cwt (14,120 kg)
• 3rd coupled	13 LT 6 cwt 2 qtr (13,540 kg)
• 4th coupled	13 LT 2 cwt (13,310 kg)
• 5th coupled	12 LT 18 cwt (13,110 kg)
• 6th coupled	13 LT 16 cwt (14,020 kg)
• Tender bogie	Bogie 1: 20 LT 7 cwt (20,680 kg); Bogie 2: 22 LT 10 cwt (22,860 kg)
Adhesive weight	79 LT 14 cwt 2 qtr (81,000 kg)
Loco weight	86 LT 11 cwt 2 qtr (87,960 kg)
Tender weight	42 LT 17 cwt (43,540 kg)
Total weight	129 LT 8 cwt 2 qtr (131,500 kg)
Tender type	2-axle bogies
Fuel type	Coal
Fuel capacity	8 LT 5 cwt (8.4 t)
Water cap.	4,000 imp gal (18,000 L)
Firebox:
• Type	Round-top & combustion chamber
• Grate area	40 sq ft (3.7 m2)
Boiler:;
• Pitch	7 ft 4 in (2,235 mm)
• Diameter	5 ft 4 in (1,626 mm)
• Tube plates	17 ft 10+1⁄2 in (5,448 mm)
• Small tubes	230: 2+1⁄4 in (57 mm)
Boiler pressure	200 psi (1,379 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	125 sq ft (11.6 m2)
• Tubes	2,422 sq ft (225.0 m2)
• Total surface	2,574 sq ft (239.1 m2)
Cylinders	Four
High-pressure cylinder	17+1⁄2 in (444 mm) bore; 26 in (660 mm) stroke
Low-pressure cylinder	28 in (711 mm) bore; 26 in (660 mm) stroke
Valve gear	Walschaerts
Valve type	HP: Piston; LP: Richardson balanced slide
Valve travel	HP: 5 in (127 mm); LP: 5+1⁄2 in (140 mm)
Valve lap	HP: 1 in (25 mm); LP: 7⁄8 in (22 mm)
Valve lead	HP & LP: 3⁄16 in (5 mm)
Couplers	Johnston link-and-pin
Tractive effort
Performance figures
Tractive effort	44,810 lbf (199.3 kN) @ 50%
Operators
Career
Operators	Natal Government Railways; South African Railways
Class	NGR Mallet; SAR Class MA
Number in class	1
Numbers	NGR 336, SAR 1601
Delivered	1909
First run	1909
Withdrawn	1927

The South African Railways Class MA 2-6-6-0 of 1909 was a steam locomotive from the pre-Union era in the Natal Colony.

In 1909, the Natal Government Railways placed a single 2-6-6-0 Mallet articulated compound steam locomotive in service. In 1912, when it was assimilated into the South African Railways, it was renumbered and designated Class MA.