South African Class 1A 4-8-0

Specifications
Specifications
Configuration:;
• Whyte	4-8-0 (Mastodon)
• UIC	2'Dn2
Driver	2nd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	28+1⁄2 in (724 mm)
Coupled dia.	46 in (1,168 mm)
Tender wheels	30 in (762 mm)
Wheelbase	50 ft 3+1⁄4 in (15,323 mm)
• Engine	22 ft 6 in (6,858 mm)
• Leading	6 ft (1,829 mm)
• Coupled	12 ft 9 in (3,886 mm)
• Tender	16 ft 6 in (5,029 mm)
• Tender bogie	4 ft 6 in (1,372 mm)
Length:;
• Over couplers	57 ft 10 in (17,628 mm)
Height	12 ft 7+1⁄4 in (3,842 mm)
Frame type	Plate
Axle load	14 LT 11 cwt (14,780 kg)
• Leading	13 LT 12 cwt (13,820 kg)
• 1st coupled	14 LT 7 cwt (14,580 kg)
• 2nd coupled	14 LT 11 cwt (14,780 kg)
• 3rd coupled	13 LT 17 cwt (14,070 kg)
• 4th coupled	14 LT 6 cwt (14,530 kg)
• Tender bogie	Bogie 1: 20 LT 1 cwt (20,370 kg); Bogie 2: 20 LT 10 cwt (20,830 kg)
• Tender axle	10 LT 5 cwt (10,410 kg)
Adhesive weight	57 LT 1 cwt (57,970 kg)
Loco weight	70 LT 13 cwt (71,780 kg)
Tender weight	40 LT 11 cwt (41,200 kg)
Total weight	111 LT 4 cwt (113,000 kg)
Tender type	TJ (2-axle bogies); TJ, TL, TM permitted
Fuel type	Coal
Fuel capacity	6 LT (6.1 t)
Water cap.	3,500 imp gal (15,900 L)
Firebox:
• Type	Belpaire & combustion chamber
• Grate area	34 sq ft (3.2 m2)
Boiler:;
• Pitch	7 ft 4+1⁄4 in (2,242 mm)
• Diameter	5 ft 4+1⁄2 in (1,638 mm)
• Tube plates	12 ft 1 in (3,683 mm)
• Small tubes	325: 2 in (51 mm)
Boiler pressure	190 psi (1,310 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	132 sq ft (12.3 m2)
• Tubes	2,056 sq ft (191.0 m2)
• Total surface	2,188 sq ft (203.3 m2)
Cylinders	Two
Cylinder size	20+1⁄2 in (521 mm) bore; 24 in (610 mm) stroke
Valve gear	Walschaerts
Valve type	Murdoch's D slide; Piston on no. 33
Couplers	Johnston link-and-pin; AAR knuckle (1930s)

Type and origin
Type and origin
Power type	Steam
Designer	Natal Government Railways; (D.A. Hendrie)
Builder	North British Locomotive Company
Serial number	19051-19071
Model	NGR Hendrie B
Build date	1910
Total produced	21

NGR Class B 4-8-0 1910
South African Class 1A 4-8-0
NGR Class B 4-8-0 1910; South African Class 1A 4-8-0
	SAR Class 1A no. 1301, ex NGR Class B no. 25,; Mason's Mill Loco, 6 July 1962
Power type
Type and origin
Power type	Steam
Designer	Natal Government Railways; (D.A. Hendrie)
Builder	North British Locomotive Company
Serial number	19051-19071
Model	NGR Hendrie B
Build date	1910
Total produced	21
Configuration:;
Specifications
Configuration:;
• Whyte	4-8-0 (Mastodon)
• UIC	2'Dn2
Driver	2nd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	28+1⁄2 in (724 mm)
Coupled dia.	46 in (1,168 mm)
Tender wheels	30 in (762 mm)
Wheelbase	50 ft 3+1⁄4 in (15,323 mm)
• Engine	22 ft 6 in (6,858 mm)
• Leading	6 ft (1,829 mm)
• Coupled	12 ft 9 in (3,886 mm)
• Tender	16 ft 6 in (5,029 mm)
• Tender bogie	4 ft 6 in (1,372 mm)
Length:;
• Over couplers	57 ft 10 in (17,628 mm)
Height	12 ft 7+1⁄4 in (3,842 mm)
Frame type	Plate
Axle load	14 LT 11 cwt (14,780 kg)
• Leading	13 LT 12 cwt (13,820 kg)
• 1st coupled	14 LT 7 cwt (14,580 kg)
• 2nd coupled	14 LT 11 cwt (14,780 kg)
• 3rd coupled	13 LT 17 cwt (14,070 kg)
• 4th coupled	14 LT 6 cwt (14,530 kg)
• Tender bogie	Bogie 1: 20 LT 1 cwt (20,370 kg); Bogie 2: 20 LT 10 cwt (20,830 kg)
• Tender axle	10 LT 5 cwt (10,410 kg)
Adhesive weight	57 LT 1 cwt (57,970 kg)
Loco weight	70 LT 13 cwt (71,780 kg)
Tender weight	40 LT 11 cwt (41,200 kg)
Total weight	111 LT 4 cwt (113,000 kg)
Tender type	TJ (2-axle bogies); TJ, TL, TM permitted
Fuel type	Coal
Fuel capacity	6 LT (6.1 t)
Water cap.	3,500 imp gal (15,900 L)
Firebox:
• Type	Belpaire & combustion chamber
• Grate area	34 sq ft (3.2 m2)
Boiler:;
• Pitch	7 ft 4+1⁄4 in (2,242 mm)
• Diameter	5 ft 4+1⁄2 in (1,638 mm)
• Tube plates	12 ft 1 in (3,683 mm)
• Small tubes	325: 2 in (51 mm)
Boiler pressure	190 psi (1,310 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	132 sq ft (12.3 m2)
• Tubes	2,056 sq ft (191.0 m2)
• Total surface	2,188 sq ft (203.3 m2)
Cylinders	Two
Cylinder size	20+1⁄2 in (521 mm) bore; 24 in (610 mm) stroke
Valve gear	Walschaerts
Valve type	Murdoch's D slide; Piston on no. 33
Couplers	Johnston link-and-pin; AAR knuckle (1930s)
Tractive effort
Performance figures
Tractive effort	31,240 lbf (139.0 kN) @ 75%
Operators
Career
Operators	Natal Government Railways; South African Railways
Class	NGR Class B; SAR Class 1A
Number in class	21
Numbers	NGR 13-33; SAR 1289-1309
Delivered	1910
First run	1910
Withdrawn	1974
	The leading coupled axle had flangeless wheels

The South African Railways Class 1A 4-8-0 of 1910 was a steam locomotive from the pre-Union era in the Colony of Natal.

In 1910, the Natal Government Railways placed 21 improved Class B 4-8-0 Mastodon type tender locomotives in service. In 1912, when these locomotives were assimilated into the South African Railways, they were renumbered and designated Class 1A.