South African Class NG3 4-6-2T

Specifications
Specifications
Configuration:;
• Whyte	4-6-2T
• UIC	2'C1'n2t
Driver	2nd coupled axle
Gauge	2 ft (610 mm) narrow
Leading dia.	18 in (457 mm)
Coupled dia.	30 in (762 mm)
Trailing dia.	21 in (533 mm)
Wheelbase	17 ft 9 in (5,410 mm)
• Leading	3 ft 6 in (1,067 mm)
• Coupled	5 ft 9 in (1,753 mm)
Length:;
• Over couplers	24 ft 11 in (7,595 mm)
Height	9 ft 4+1⁄2 in (2,858 mm)
Frame type	Plate
Axle load	5 LT 16 cwt (5,893 kg)
• Leading	3 LT 14 cwt (3,759 kg)
• 1st coupled	5 LT 16 cwt (5,893 kg)
• 2nd coupled	5 LT 16 cwt (5,893 kg)
• 3rd coupled	5 LT 15 cwt (5,842 kg)
• Trailing	4 LT 8 cwt (4,471 kg)
Adhesive weight	17 LT 7 cwt (17,630 kg)
Loco weight	25 LT 9 cwt (25,860 kg)
Fuel type	Coal
Fuel capacity	21 long hundredweight (1.1 t)
Water cap.	784 imp gal (3,560 L)
Firebox:
• Type	Round-top
• Grate area	11 sq ft (1.0 m2)
Boiler:;
• Pitch	4 ft 6 in (1,372 mm)
• Diameter	3 ft 3+1⁄2 in (1,003 mm)
• Tube plates	11 ft 2+1⁄8 in (3,407 mm)
• Small tubes	124: 1+3⁄4 in (44 mm)
Boiler pressure	165 psi (1,138 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	41 sq ft (3.8 m2)
• Tubes	634.9 sq ft (58.98 m2)
• Total surface	675.9 sq ft (62.79 m2)
Cylinders	Two
Cylinder size	11+1⁄2 in (292 mm) bore; 15 in (381 mm) stroke
Valve gear	Walschaerts
Couplers	Johnston link-and-pin (Natal); Bell-and-hook (Cape)

Type and origin
Type and origin
Power type	Steam
Designer	Natal Government Railways; (D.A. Hendrie)
Builder	Hawthorn Leslie and Company
Serial number	2687–2692
Build date	1907
Total produced	6

NGR Class N 4-6-2T 1907
South African Class NG3 4-6-2T
NGR Class N 4-6-2T 1907; South African Class NG3 4-6-2T
	NGR Hawthorn Leslie no. 4; SAR Class NG3 no. NG4
Power type
Type and origin
Power type	Steam
Designer	Natal Government Railways; (D.A. Hendrie)
Builder	Hawthorn Leslie and Company
Serial number	2687–2692
Build date	1907
Total produced	6
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-2T
• UIC	2'C1'n2t
Driver	2nd coupled axle
Gauge	2 ft (610 mm) narrow
Leading dia.	18 in (457 mm)
Coupled dia.	30 in (762 mm)
Trailing dia.	21 in (533 mm)
Wheelbase	17 ft 9 in (5,410 mm)
• Leading	3 ft 6 in (1,067 mm)
• Coupled	5 ft 9 in (1,753 mm)
Length:;
• Over couplers	24 ft 11 in (7,595 mm)
Height	9 ft 4+1⁄2 in (2,858 mm)
Frame type	Plate
Axle load	5 LT 16 cwt (5,893 kg)
• Leading	3 LT 14 cwt (3,759 kg)
• 1st coupled	5 LT 16 cwt (5,893 kg)
• 2nd coupled	5 LT 16 cwt (5,893 kg)
• 3rd coupled	5 LT 15 cwt (5,842 kg)
• Trailing	4 LT 8 cwt (4,471 kg)
Adhesive weight	17 LT 7 cwt (17,630 kg)
Loco weight	25 LT 9 cwt (25,860 kg)
Fuel type	Coal
Fuel capacity	21 long hundredweight (1.1 t)
Water cap.	784 imp gal (3,560 L)
Firebox:
• Type	Round-top
• Grate area	11 sq ft (1.0 m2)
Boiler:;
• Pitch	4 ft 6 in (1,372 mm)
• Diameter	3 ft 3+1⁄2 in (1,003 mm)
• Tube plates	11 ft 2+1⁄8 in (3,407 mm)
• Small tubes	124: 1+3⁄4 in (44 mm)
Boiler pressure	165 psi (1,138 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	41 sq ft (3.8 m2)
• Tubes	634.9 sq ft (58.98 m2)
• Total surface	675.9 sq ft (62.79 m2)
Cylinders	Two
Cylinder size	11+1⁄2 in (292 mm) bore; 15 in (381 mm) stroke
Valve gear	Walschaerts
Couplers	Johnston link-and-pin (Natal); Bell-and-hook (Cape)
Tractive effort
Performance figures
Tractive effort	8,183 lbf (36.40 kN) @ 75%
Operators
Career
Operators	Natal Government Railways; South African Railways
Class	NGR Class N, SAR Class NG3
Number in class	6
Numbers	NGR 4–9, SAR NG4-NG9
Delivered	1907
First run	1907
Withdrawn	1946

The South African Railways Class NG3 4-6-2T of 1907 was a narrow-gauge steam locomotive from the pre-Union era in the Colony of Natal.

In 1907, the Natal Government Railways placed six 4-6-2 T Pacific type narrow-gauge steam locomotives in service. In 1912, when these locomotives were assimilated into the South African Railways, they retained their engine numbers, but with an "NG" prefix added. When a system of grouping narrow-gauge locomotives into classes was eventually introduced somewhere between 1928 and 1930, they were designated Class NG3.