South African Class 16A 4-6-2

Specifications
Specifications
Configuration:;
• Whyte	4-6-2 (Pacific)
• UIC	2'C1'h4
Driver	1st coupled axle (Inner cylinders); 2nd coupled axle (Outer cylinders)
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	30 in (762 mm)
Coupled dia.	60 in (1,524 mm)
Trailing dia.	33 in (838 mm)
Tender wheels	34 in (864 mm)
Wheelbase	57 ft 7+1⁄4 in (17,558 mm)
• Engine	31 ft 1 in (9,474 mm)
• Leading	6 ft 2 in (1,880 mm)
• Coupled	10 ft 9 in (3,277 mm)
• Tender	16 ft 9 in (5,105 mm)
• Tender bogie	4 ft 7 in (1,397 mm)
Length:;
• Over couplers	65 ft 11+5⁄8 in (20,107 mm)
Height	12 ft 10 in (3,912 mm)
Axle load	16 LT 18 cwt (17,170 kg)
• Leading	16 LT 8 cwt (16,660 kg)
• Coupled	16 LT 18 cwt (17,170 kg)
• Trailing	14 LT (14,220 kg)
• Tender bogie	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	50 LT 14 cwt (51,510 kg)
Loco weight	81 LT 2 cwt (82,400 kg)
Tender weight	51 LT 1 cwt (51,870 kg)
Total weight	132 LT 3 cwt (134,300 kg)
Tender type	MP1 (2-axle bogies); MP, MP1, MR, MS, MT, MT1, MT2, MX, MY, MY1 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	36 sq ft (3.3 m2)
Boiler:;
• Pitch	7 ft 9 in (2,362 mm)
• Diameter	5 ft 1+5⁄8 in (1,565 mm)
• Tube plates	19 ft 9 in (6,020 mm)
• Small tubes	119: 2+1⁄4 in (57 mm)
• Large tubes	21: 5+1⁄2 in (140 mm)
Boiler pressure	200 psi (1,379 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	146 sq ft (13.6 m2)
• Tubes	1,975.5 sq ft (183.53 m2)
• Total surface	2,121.5 sq ft (197.09 m2)
Superheater:;
• Heating area	459.5 sq ft (42.69 m2)
Cylinders	Four
Cylinder size	14 in (356 mm) bore; 26 in (660 mm) stroke
Valve gear	Walschaerts
Valve type	Piston
Couplers	Johnston link-and-pin; AAR knuckle (1930s)

Type and origin
Type and origin
Power type	Steam
Designer	South African Railways; (D.A. Hendrie)
Builder	North British Locomotive Company
Serial number	20956-20957
Model	Class 16A
Build date	1915
Total produced	2

South African Class 16A 4-6-2
South African Class 16A 4-6-2
	Builder’s picture of no. 852
Power type
Type and origin
Power type	Steam
Designer	South African Railways; (D.A. Hendrie)
Builder	North British Locomotive Company
Serial number	20956-20957
Model	Class 16A
Build date	1915
Total produced	2
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-2 (Pacific)
• UIC	2'C1'h4
Driver	1st coupled axle (Inner cylinders); 2nd coupled axle (Outer cylinders)
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	30 in (762 mm)
Coupled dia.	60 in (1,524 mm)
Trailing dia.	33 in (838 mm)
Tender wheels	34 in (864 mm)
Wheelbase	57 ft 7+1⁄4 in (17,558 mm)
• Engine	31 ft 1 in (9,474 mm)
• Leading	6 ft 2 in (1,880 mm)
• Coupled	10 ft 9 in (3,277 mm)
• Tender	16 ft 9 in (5,105 mm)
• Tender bogie	4 ft 7 in (1,397 mm)
Length:;
• Over couplers	65 ft 11+5⁄8 in (20,107 mm)
Height	12 ft 10 in (3,912 mm)
Axle load	16 LT 18 cwt (17,170 kg)
• Leading	16 LT 8 cwt (16,660 kg)
• Coupled	16 LT 18 cwt (17,170 kg)
• Trailing	14 LT (14,220 kg)
• Tender bogie	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	50 LT 14 cwt (51,510 kg)
Loco weight	81 LT 2 cwt (82,400 kg)
Tender weight	51 LT 1 cwt (51,870 kg)
Total weight	132 LT 3 cwt (134,300 kg)
Tender type	MP1 (2-axle bogies); MP, MP1, MR, MS, MT, MT1, MT2, MX, MY, MY1 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	36 sq ft (3.3 m2)
Boiler:;
• Pitch	7 ft 9 in (2,362 mm)
• Diameter	5 ft 1+5⁄8 in (1,565 mm)
• Tube plates	19 ft 9 in (6,020 mm)
• Small tubes	119: 2+1⁄4 in (57 mm)
• Large tubes	21: 5+1⁄2 in (140 mm)
Boiler pressure	200 psi (1,379 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	146 sq ft (13.6 m2)
• Tubes	1,975.5 sq ft (183.53 m2)
• Total surface	2,121.5 sq ft (197.09 m2)
Superheater:;
• Heating area	459.5 sq ft (42.69 m2)
Cylinders	Four
Cylinder size	14 in (356 mm) bore; 26 in (660 mm) stroke
Valve gear	Walschaerts
Valve type	Piston
Couplers	Johnston link-and-pin; AAR knuckle (1930s)
Tractive effort
Performance figures
Tractive effort	25,480 lbf (113.3 kN) @ 75%
Operators
Career
Operators	South African Railways
Class	Class 16A
Number in class	2
Numbers	851–852
Delivered	1915
First run	1915
Withdrawn	1944
	The 2nd coupled axle had flangeless wheels

The South African Railways Class 16A 4-6-2 of 1915 was a steam locomotive.

In 1915, the South African Railways placed two experimental four-cylinder simple expansion steam locomotives with a 4-6-2 Pacific type wheel arrangement in passenger train service. They were designated Class 16A.^[1]^[2]^[3]

^ Holland, D. F. (1972). Steam Locomotives of the South African Railways. Vol. 2: 1910-1955 (1st ed.). Newton Abbott, England: David & Charles. p. 30. 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, August 1945. pp. 594-595.
^ Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 10–11, 65–66. 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. 30. ISBN 978-0-7153-5427-8.

[SAR&H_Aug_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, August 1945. pp. 594-595.

[Paxton-Bourne-3] Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 10–11, 65–66. ISBN 0869772112.

[1]

[2]

[3]

South African Class 16A 4-6-2

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