CGR 5th Class 4-6-0 1891

CGR 5th Class 4-6-0 1891 OVGS 5th Class K 4-6-0 1891 South African Class 05 4-6-0 1891
CGR no. 122, SAR no. 0122, c. 1920
Type and origin Power type Steam Designer Cape Government Railways (Michael Stephens) Builder Dübs and Company Serial number 2712-2741 Model CGR 5th Build date 1891 Total produced 30
Specifications Configuration: ​  • Whyte 4-6-0 (Tenwheeler)  • UIC 2'Cn2 Driver 2nd coupled axle Gauge 3 ft 6 in (1,067 mm) Cape gauge Leading dia. 28 in (711 mm) Coupled dia. 49 in (1,245 mm) Tender wheels 37 inches (940 mm) Wheelbase 40 ft 2+3⁄8 in (12,252 mm)  • Engine 19 ft 1+3⁄8 in (5,826 mm)  • Leading 5 ft (1,524 mm)  • Coupled 10 ft (3,048 mm)  • Tender 10 ft (3,048 mm) Wheel spacing (Asymmetrical) 1-2: 4 ft 6 in (1,372 mm) 2-3: 5 ft 6 in (1,676 mm) Length: ​  • Over couplers 48 ft 1+3⁄4 in (14,675 mm) Height 12 ft 1+1⁄2 in (3,696 mm) Axle load 10 LT 8 cwt (10,570 kg)  • Leading 7 LT 15 cwt (7,874 kg)  • 1st coupled 10 LT 8 cwt (10,570 kg)  • 2nd coupled 10 LT 8 cwt (10,570 kg)  • 3rd coupled 9 LT 15 cwt (9,906 kg) Loco weight 38 LT 6 cwt (38,910 kg) Tender weight 28 LT 11 cwt (29,010 kg) Total weight 66 LT 17 cwt (67,920 kg) Tender type 3-axle Fuel type Coal Fuel capacity 4 LT (4.1 t) Water cap 1,950 imp gal (8,860 l) Firebox type Round-top, as built Belpaire, by CSAR  • Firegrate area 16.18 sq ft (1.503 m2) Boiler: ​  • Pitch 6 ft 4+1⁄2 in (1,943 mm)  • Diameter 4 ft (1,219 mm)  • Tube plates 11 ft 1+7⁄8 in (3,400 mm)  • Small tubes 185: 1+3⁄4 in (44 mm) Boiler pressure 150 psi (1,034 kPa) Safety valve Ramsbottom Heating surface 1,037.28 sq ft (96.366 m2)  • Tubes 946.32 sq ft (87.916 m2)  • Firebox 90.96 sq ft (8.450 m2) Cylinders Two Cylinder size 16 in (406 mm) bore 24 in (610 mm) stroke Valve gear Stephenson Couplers Johnston link-and-pin
Performance figures Tractive effort 14,110 lbf (62.8 kN) @ 75%
Career Operators Cape Government Railways OVGS New Cape Central Railway Imperial Military Railways Central South African Railways South African Railways Class CGR 5th Class, SAR Class 05 Number in class 30 Numbers Eastern 55-58 Midland 136-138 & 309-314 Western 117-118, 121-135 Delivered 1891 First run 1891 Withdrawn 1953

The Cape Government Railways 5th Class 4-6-0 of 1891 was a South African steam locomotive from the pre-Union era in the Cape of Good Hope.

In 1891, the Cape Government Railways placed a second batch of thirty 5th Class tender locomotives with a 4-6-0 Tenwheeler type wheel arrangement in mainline service on all three Cape Systems. They were similar to the previous batch of 1890, but differed in respect of the diameter of their coupled wheels, the length of their smokeboxes and their tractive effort.^[1]

Manufacturer[]

Michael Stephens

The second batch of Cape Government Railways (CGR) 5th Class 4-6-0 Tenwheeler type tender locomotives was delivered from Dübs and Company in 1891.^[1]

Of the thirty locomotives, four went to the Eastern System to work out of East London, numbered in the range from 55 to 58, nine went to the Midland System to work out of Port Elizabeth, numbered in the ranges from 136 to 138 and 309 to 314, and seventeen went to the Western System for service between Touws River and Beaufort West, numbered 117, 118 and in the range from 121 to 135.^[1]

The order had originally been for 36 locomotives. In 1891, a complete design for a new 7th Class 4-8-0 Mastodon type locomotive was prepared at the Salt River works in Cape Town. The last six locomotives of the order were cancelled and substituted with an order for six of these new 7th Class locomotives.^[1][2][3]

Characteristics[]

While the 1891 locomotive was identical to the batch of 1890 in most respects, it differed in three aspects.

• It had larger coupled wheels with a 49 inches (1,240 millimetres) diameter, compared to the 46 inches (1,170 millimetres) of the earlier locomotives.
• As a result of the larger coupled wheels, its tractive effort was reduced from 15,030 to 14,110 pounds-force (66.9 to 62.8 kilonewtons) at 75% boiler pressure.
• It had a longer smokebox. On the 1890 locomotive, the chimney was so close to the front of the smokebox that the headlight had to be mounted on a platform attached to the front of the smokebox, while on the 1891 locomotive there was sufficient space ahead of the chimney to mount the huge headlight on top of the smokebox.^[1]

In the 1890s, some improvements to smokebox design took place. Extending the smokebox forward increased its volume. The increased amount of exhaust gases present in the smokebox had the effect of stabilising and improving the draught. The date of this improvement can be pinned to the introduction of this second batch of 5th Class locomotives with their lengthened smokeboxes. This had such a profound effect on the boiler’s steaming ability that virtually every serving locomotive on the CGR and Natal Government Railways (NGR) had their smokeboxes extended.^[4]

Service[]

Cape Government Railways[]

The 5th Class was considered to be the first really efficient all-round locomotive in the Cape of Good Hope. It was used on all kinds of traffic, wherever the mainline had severe gradients and curves.^[1]

No. 134 with extended smokebox, c. 1910

At least one of the Western System’s locomotives, no. 134, was modified by the CGR by having the smokebox extended even further forward to almost flush with the buffer beam. The reason for this modification is not known, but it was possibly done to make room for a spark arrester, as was done with the 4th Class 4-6-0TT of 1880 on the Eastern system.

Oranje-Vrijstaat Gouwerment-Spoorwegen[]

In late 1896, ten of these locomotives, six from the Midland System and four from the Western System, were sold to the newly established Oranje-Vrijstaat Gouwerment-Spoorwegen (OVGS) of the Orange Free State. On the OVGS, they were designated 5th Class K and renumbered in the range from 49 to 58.^[1][5][6]

New Cape Central Railway[]

The New Cape Central Railway (NCCR) was a private railway company which, by 1894, operated a branchline from Worcester via Robertson and Roodewal to Swellendam. In 1897, the Midland System's engine no. 136 was sold to the NCCR, where it was renumbered to no. 8.^[1][7]

Central South African Railways[]

During the Second Boer War, control of all railways in the Orange Free State and Transvaal was taken over by the Imperial Military Railways. At the end of the war in 1902, the ten ex-OVGS locomotives came onto the roster of the Central South African Railways (CSAR), where they were renumbered in the ranges from 315 to 317 and 326 to 332.^[1][8]

Reboilered CSAR no. 327, SAR no. 0327, c. 1920

In 1904, the CSAR reboilered three of these locomotives, no. 327, 328 and 329, with larger boilers with Belpaire fireboxes which were equipped with Drummond tubes. This involved the installation of cross-water tubes into the firebox, as featured on the London and South Western Railway's T9 Class and L11 Class, in an attempt to increase the heating surface area of the water, albeit at the cost of increased boiler complexity. Visible external evidence of the presence of Drummond tubes was the rectangular inspection covers which were attached to the sides of the firebox, just ahead of the cab.^[1][8]

The larger boilers and Drummond tubes increased their heating surface by 272.72 square feet (25.337 square metres) and, at a higher operating boiler pressure of 180 pounds per square inch (1,241 kilopascals), these three locomotives were able to easily haul the load of the next higher class. Since by then, however, these locomotives were being withdrawn from mainline traffic, no more such reboilerings were carried out.^[9]

South African Railways[]

When the Union of South Africa was established on 31 May 1910, the three Colonial government railways (CGR, NGR and Central South African Railways) were united under a single administration to control and administer the railways, ports and harbours of the Union. Although 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 was only implemented with effect from 1 January 1912.^[5][10]

By 1912, twenty-five of these locomotives survived, nineteen on the CGR and six, including the three which had been reboilered, on the CSAR. They were considered obsolete by the South African Railways (SAR), designated Class 05 and renumbered by having the numeral "0" prefixed to their existing numbers.^[5]

During 1914, at the outbreak of the First World War, military planners followed the example set by the British invading forces during the Second Boer War and identified a requirement for armoured trains. For this purpose, five Class 05 locomotives were specially protected with armour plate and named Trafalgar, Scot, Erin, Karoo and Schrikmaker. The armour-plating was fitted by the workshops in Pretoria, Bloemfontein and Salt River. Their engine numbers are not known, nor whether they were from this Class or the Class 05 of 1890, or both.^[11]

In spite of being considered obsolete, some of the Class 05 locomotives survived as shunting engines in SAR service for another four decades, with some even getting reboilered while in SAR service. One confirmed example is no. 0138, which was still equipped with boiler no. 4825 of 1922 when it was withdrawn from service in 1953.^[12]

When they were eventually withdrawn from service in 1953, they were the last obsolete locomotives to be still in service.^[8]

Works numbers[]

By 1896, all the locomotives of the Eastern System and one of the Midland System had been renumbered. The works numbers, CGR System, original numbers, renumbering and distribution of the Cape 5th Class of 1891 are listed in the table.^[1][5]

Illustration[]

• 

  No. 128, later SAR no. 0128, on the old Kei River bridge, c. 1904

• 

  SAR no. 0329, ex no. 309, renumbered to 509, OVGS no. 52 and CSAR no. 329, with a Belpaire firebox, Drummond tubes and a new headlight, c. 1920

References[]

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