South African Class 1 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.	45+1⁄2 in (1,156 mm)
Tender wheels	30 in (762 mm)
Wheelbase	49 ft 5⁄8 in (14,951 mm)
• Engine	22 ft 6 in (6,858 mm)
• Leading	6 ft (1,829 mm)
• Coupled	12 ft 9 in (3,886 mm)
• Tender	15 ft 6 in (4,724 mm)
• Tender bogie	4 ft 6 in (1,372 mm)
Length:;
• Over couplers	56 ft 4+7⁄8 in (17,193 mm)
Height	12 ft 6+1⁄4 in (3,816 mm)
Frame type	Plate
Axle load	14 LT 14 cwt (14,940 kg)
• Leading	14 LT 2 cwt (14,330 kg)
• 1st coupled	13 LT 9 cwt (13,670 kg)
• 2nd coupled	14 LT 14 cwt (14,940 kg)
• 3rd coupled	13 LT 18 cwt (14,120 kg)
• 4th coupled	13 LT 18 cwt (14,120 kg)
• Tender bogie	Bogie 1: 18 LT 18 cwt (19,200 kg); Bogie 2: 19 LT 1 cwt (19,360 kg)
• Tender axle	9 LT 10 cwt 2 qtr (9,678 kg)
Adhesive weight	55 LT 19 cwt (56,850 kg)
Loco weight	70 LT 11 cwt (71,680 kg)
Tender weight	37 LT 19 cwt (38,560 kg)
Total weight	108 LT 10 cwt (110,200 kg)
Tender type	SH (2-axle bogies); SH, SK permitted
Fuel type	Coal
Fuel capacity	6 LT (6.1 t)
Water cap.	3,225 imp gal (14,700 L)
Firebox:
• Type	Belpaire with combustion chamber
• Grate area	34 sq ft (3.2 m2)
Boiler:;
• Pitch	7 ft 3+1⁄4 in (2,216 mm)
• Diameter	5 ft 4+3⁄4 in (1,645 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	Balanced slide
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	16370-16419
Model	NGR Class B
Build date	1904
Total produced	50
Rebuilder	Natal Government Railways
Rebuild date	1906
Number rebuilt	6 to Class B 4-8-2 (Mountain)

NGR Class B 4-8-0 1904
South African Class 1 4-8-0
NGR Class B 4-8-0 1904; South African Class 1 4-8-0
	SAR Class 1 no. 1245, ex NGR Class B no. 275
Power type
Type and origin
Power type	Steam
Designer	Natal Government Railways; (D.A. Hendrie)
Builder	North British Locomotive Company
Serial number	16370-16419
Model	NGR Class B
Build date	1904
Total produced	50
Rebuilder	Natal Government Railways
Rebuild date	1906
Number rebuilt	6 to Class B 4-8-2 (Mountain)
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.	45+1⁄2 in (1,156 mm)
Tender wheels	30 in (762 mm)
Wheelbase	49 ft 5⁄8 in (14,951 mm)
• Engine	22 ft 6 in (6,858 mm)
• Leading	6 ft (1,829 mm)
• Coupled	12 ft 9 in (3,886 mm)
• Tender	15 ft 6 in (4,724 mm)
• Tender bogie	4 ft 6 in (1,372 mm)
Length:;
• Over couplers	56 ft 4+7⁄8 in (17,193 mm)
Height	12 ft 6+1⁄4 in (3,816 mm)
Frame type	Plate
Axle load	14 LT 14 cwt (14,940 kg)
• Leading	14 LT 2 cwt (14,330 kg)
• 1st coupled	13 LT 9 cwt (13,670 kg)
• 2nd coupled	14 LT 14 cwt (14,940 kg)
• 3rd coupled	13 LT 18 cwt (14,120 kg)
• 4th coupled	13 LT 18 cwt (14,120 kg)
• Tender bogie	Bogie 1: 18 LT 18 cwt (19,200 kg); Bogie 2: 19 LT 1 cwt (19,360 kg)
• Tender axle	9 LT 10 cwt 2 qtr (9,678 kg)
Adhesive weight	55 LT 19 cwt (56,850 kg)
Loco weight	70 LT 11 cwt (71,680 kg)
Tender weight	37 LT 19 cwt (38,560 kg)
Total weight	108 LT 10 cwt (110,200 kg)
Tender type	SH (2-axle bogies); SH, SK permitted
Fuel type	Coal
Fuel capacity	6 LT (6.1 t)
Water cap.	3,225 imp gal (14,700 L)
Firebox:
• Type	Belpaire with combustion chamber
• Grate area	34 sq ft (3.2 m2)
Boiler:;
• Pitch	7 ft 3+1⁄4 in (2,216 mm)
• Diameter	5 ft 4+3⁄4 in (1,645 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	Balanced slide
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 1
Number in class	44
Numbers	NGR 275-318; SAR 1245-1288
Nicknames	Hendrie B
Delivered	1904
First run	1904
Withdrawn	1975
	The leading coupled axle had flangeless wheels

The South African Railways Class 1 4-8-0 of 1904 was a steam locomotive from the pre-Union era in the Colony of Natal.

In 1904, the Natal Government Railways placed fifty Class B 4-8-0 Mastodon type steam locomotives in service. Six of them were modified to a 4-8-2 Mountain type wheel arrangement in 1906. In 1912, when the remaining 44 4-8-0 locomotives were assimilated into the South African Railways, they were renumbered and designated Class 1.^[1]^[2]^[3]^[4]

^ Holland, D.F. (1971). Steam Locomotives of the South African Railways. Vol. 1: 1859–1910 (1st ed.). Newton Abbott, England: David & Charles. pp. 99–101. ISBN 978-0-7153-5382-0.
^ Espitalier, T.J.; Day, W.A.J. (1944). The Locomotive in South Africa - A Brief History of Railway Development. Chapter III - Natal Government Railways (Continued). South African Railways and Harbours Magazine, July 1944. pp. 504-505.
^ Cite error: The named reference SAR Renumber was invoked but never defined (see the help page).
^ Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 34–35. ISBN 0869772112.

[Holland_1-1] Holland, D.F. (1971). Steam Locomotives of the South African Railways. Vol. 1: 1859–1910 (1st ed.). Newton Abbott, England: David & Charles. pp. 99–101. ISBN 978-0-7153-5382-0.

[SAR&H_Jul_1944-2] Espitalier, T.J.; Day, W.A.J. (1944). The Locomotive in South Africa - A Brief History of Railway Development. Chapter III - Natal Government Railways (Continued). South African Railways and Harbours Magazine, July 1944. pp. 504-505.

[SAR_Renumber-3] Cite error: The named reference SAR Renumber was invoked but never defined (see the help page).

[Paxton-Bourne-4] Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 34–35. ISBN 0869772112.

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