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Specifications
Specifications
Configuration:;
• Whyte	2-8-0 (Consolidation)
• UIC	1'Dn2
Driver	3rd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	28+1⁄2 in (724 mm)
Coupled dia.	48 in (1,219 mm)
Tender wheels	33+1⁄2 in (851 mm) as built; 34 in (864 mm) retyred
Wheelbase	47 ft (14,326 mm)
• Axle spacing; (Asymmetrical)	1-2: 4 ft 7 in (1,397 mm); 2-3: 4 ft 3 in (1,295 mm); 3-4: 5 ft 8 in (1,727 mm)
• Engine	21 ft 8 in (6,604 mm)
• Coupled	14 ft 6 in (4,420 mm)
• Tender	14 ft 7 in (4,445 mm)
• Tender bogie	4 ft 7 in (1,397 mm)
Length:;
• Over couplers	54 ft 9+1⁄2 in (16,700 mm)
Height	12 ft 10 in (3,912 mm)
Frame type	Bar
Axle load	13 LT (13,210 kg)
• Leading	5 LT (5,080 kg)
• 1st coupled	12 LT 11 cwt (12,750 kg)
• 2nd coupled	12 LT 17 cwt (13,060 kg)
• 3rd coupled	13 LT (13,210 kg)
• 4th coupled	13 LT (13,210 kg)
• Tender bogie	Bogie 1: 17 LT 13 cwt (17,930 kg); Bogie 2: 18 LT 16 cwt (19,100 kg)
• Tender axle	9 LT 8 cwt (9,551 kg)
Adhesive weight	51 LT 8 cwt (52,220 kg)
Loco weight	56 LT 8 cwt (57,310 kg)
Tender weight	36 LT 9 cwt (37,030 kg)
Total weight	92 LT 17 cwt (94,340 kg)
Tender type	XE1 (2-axle bogies)
Fuel type	Coal
Fuel capacity	10 LT (10.2 t)
Water cap.	2,855 imp gal (13,000 L)
Firebox:
• Type	Round-top
• Grate area	32 sq ft (3.0 m2)
Boiler:;
• Pitch	7 ft 3 in (2,210 mm)
• Diameter	4 ft 11 in (1,499 mm)
• Tube plates	12 ft 5+11⁄16 in (3,802 mm)
• Small tubes	194: 2 in (51 mm)
Boiler pressure	180 psi (1,241 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	106 sq ft (9.8 m2)
• Tubes	1,355 sq ft (125.9 m2)
• Total surface	1,461 sq ft (135.7 m2)
Cylinders	Two
Cylinder size	18+1⁄2 in (470 mm) bore; 24 in (610 mm) stroke
Valve gear	Stephenson
Valve type	Slide
Couplers	Johnston link-and-pin

Type and origin
Type and origin
Power type	Steam
Designer	Cape Government Railways; (H.M. Beatty)
Builder	North British Locomotive Company
Serial number	16095-16102
Model	CGR 8th Class (2-8-0)
Build date	1904
Total produced	8

CGR 8th Class 2-8-0 1904
South African Class 8Z 2-8-0
CGR 8th Class 2-8-0 1904; South African Class 8Z 2-8-0
	CGR 8th Class no. 825, SAR Class 8Z no. 904
Power type
Type and origin
Power type	Steam
Designer	Cape Government Railways; (H.M. Beatty)
Builder	North British Locomotive Company
Serial number	16095-16102
Model	CGR 8th Class (2-8-0)
Build date	1904
Total produced	8
Configuration:;
Specifications
Configuration:;
• Whyte	2-8-0 (Consolidation)
• UIC	1'Dn2
Driver	3rd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	28+1⁄2 in (724 mm)
Coupled dia.	48 in (1,219 mm)
Tender wheels	33+1⁄2 in (851 mm) as built; 34 in (864 mm) retyred
Wheelbase	47 ft (14,326 mm)
• Axle spacing; (Asymmetrical)	1-2: 4 ft 7 in (1,397 mm); 2-3: 4 ft 3 in (1,295 mm); 3-4: 5 ft 8 in (1,727 mm)
• Engine	21 ft 8 in (6,604 mm)
• Coupled	14 ft 6 in (4,420 mm)
• Tender	14 ft 7 in (4,445 mm)
• Tender bogie	4 ft 7 in (1,397 mm)
Length:;
• Over couplers	54 ft 9+1⁄2 in (16,700 mm)
Height	12 ft 10 in (3,912 mm)
Frame type	Bar
Axle load	13 LT (13,210 kg)
• Leading	5 LT (5,080 kg)
• 1st coupled	12 LT 11 cwt (12,750 kg)
• 2nd coupled	12 LT 17 cwt (13,060 kg)
• 3rd coupled	13 LT (13,210 kg)
• 4th coupled	13 LT (13,210 kg)
• Tender bogie	Bogie 1: 17 LT 13 cwt (17,930 kg); Bogie 2: 18 LT 16 cwt (19,100 kg)
• Tender axle	9 LT 8 cwt (9,551 kg)
Adhesive weight	51 LT 8 cwt (52,220 kg)
Loco weight	56 LT 8 cwt (57,310 kg)
Tender weight	36 LT 9 cwt (37,030 kg)
Total weight	92 LT 17 cwt (94,340 kg)
Tender type	XE1 (2-axle bogies)
Fuel type	Coal
Fuel capacity	10 LT (10.2 t)
Water cap.	2,855 imp gal (13,000 L)
Firebox:
• Type	Round-top
• Grate area	32 sq ft (3.0 m2)
Boiler:;
• Pitch	7 ft 3 in (2,210 mm)
• Diameter	4 ft 11 in (1,499 mm)
• Tube plates	12 ft 5+11⁄16 in (3,802 mm)
• Small tubes	194: 2 in (51 mm)
Boiler pressure	180 psi (1,241 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	106 sq ft (9.8 m2)
• Tubes	1,355 sq ft (125.9 m2)
• Total surface	1,461 sq ft (135.7 m2)
Cylinders	Two
Cylinder size	18+1⁄2 in (470 mm) bore; 24 in (610 mm) stroke
Valve gear	Stephenson
Valve type	Slide
Couplers	Johnston link-and-pin
Tractive effort
Performance figures
Tractive effort	23,110 lbf (102.8 kN) @ 75%
Operators
Career
Operators	Cape Government Railways; South African Railways
Class	CGR 8th Class (2-8-0); SAR Class 8Z
Number in class	8
Numbers	CGR 821-828, SAR 900-907
Delivered	1904
First run	1904
Withdrawn	1935
	The 2nd & 3rd coupled axles had flangeless wheels

The South African Railways Class 8Z 2-8-0 of 1904 was a steam locomotive from the pre-Union era in the Cape of Good Hope.

In 1904, the Cape Government Railways placed its last eight 8th Class 2-8-0 Consolidation type steam locomotives in service. Most of its other 8th Class locomotives were built with a 4-8-0 Mastodon type wheel arrangement. In 1912, when they were assimilated into the South African Railways, these eight were renumbered and designated Class 8Z.^[1]^[2]

Manufacturer

The first locomotive in the Cape Government Railways (CGR) 2-8-0 Consolidation type 8th Class, later to become the South African Railways (SAR) Class 8X, was designed by H.M. Beatty, the CGR's Chief Locomotive Superintendent from 1896 to 1910.^[1]

In 1904, a third batch of eight of these locomotives was delivered from the North British Locomotive Company of Glasgow, Scotland. All eight were allocated to the Western System of the CGR, numbered in the range from 821 to 828.^[1]^[3]

Characteristics

These locomotives were very similar to the previous four Kitson-built Consolidations, but slightly larger in boiler and firegrate area dimensions. They also used saturated steam and cylinders with overhead slide valves, actuated by inside Stephenson valve gear. Of the three models of Type XE1 tender which were in use at the time, these locomotives were equipped with the version which had the 10 long tons (10.2 tonnes) coal capacity.^[1]^[2]^[4]

Class 8 sub-classes

When the Union of South Africa was established on 31 May 1910, the three Colonial government railways (CGR, Natal Government Railways and Central South African Railways) were united under a single administration to control and administer the railways, ports and harbours of the Union. Even though the South African Railways and Harbours came into existence in 1910, the actual classification and renumbering of all the rolling stock of the three constituent railways were only implemented with effect from 1 January 1912.^[2]^[5]

In 1912, these locomotives were designated Class 8Z on the South African Railways (SAR) and renumbered in the range from 900 to 907.^[1]^[2]^[4]

In spite of the difference in wheel arrangement, the CGR grouped its 2-8-0 Consolidation and post-7th Class 4-8-0 Mastodon locomotives together as the 8th Class. In 1912, all these 2-8-0 and 4-8-0 locomotives, together with the Classes 8-L1 to 8-L3 4-8-0 Mastodon locomotives from the Central South African Railways (CSAR), were grouped into ten different sub-classes by the SAR. The 4-8-0 locomotives became SAR Classes 8 and 8A to 8F and the 2-8-0 locomotives became Classes 8X to 8Z.^[1]^[4]^[6]

Service

In SAR service, the Class 8Z was used mainly in the Western Cape, shedded at Touws River. A few later ended up at Bloemfontein in the Orange Free State and Klerksdorp in Transvaal. They were withdrawn by 1935.^[4]

Illustration

The main picture shows no. 804 at Touws River, c. 1930.

Class 8Z as depicted on a SAR museum playing card

References

^ ^a ^b ^c ^d ^e ^f Holland, D.F. (1971). Steam Locomotives of the South African Railways. Vol. 1: 1859–1910 (1st ed.). Newton Abbott, England: David & Charles. pp. 64–66. ISBN 978-0-7153-5382-0.
^ ^a ^b ^c ^d Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer's Office, Pretoria, January 1912, pp. 9, 12, 15, 36 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
^ North British Locomotive Company works list, compiled by Austrian locomotive historian Bernhard Schmeiser
^ ^a ^b ^c ^d Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. p. 50. ISBN 0869772112.
^ The South African Railways - Historical Survey. Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd., Published c. 1978, p. 25.
^ South African Railways and Harbours Locomotive Diagram Book, 2'0" & 3'6" Gauge Steam Locomotives, 15 August 1941, as amended