[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/south-african-class-6z-2-6-4\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki24\/south-african-class-6z-2-6-4\/","headline":"South African Class 6Z 2-6-4","name":"South African Class 6Z 2-6-4","description":"before-content-x4 CGR 6th Class 2-6-4South African Class 6Z 2-6-4 CGR 6th Class 2-6-2 Prairie as built, before modification to 2-6-4","datePublished":"2014-11-22","dateModified":"2014-11-22","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki24\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/f\/ff\/SAR_Klasse_6Z.jpg\/300px-SAR_Klasse_6Z.jpg","url":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/f\/ff\/SAR_Klasse_6Z.jpg\/300px-SAR_Klasse_6Z.jpg","height":"99","width":"300"},"url":"https:\/\/wiki.edu.vn\/en\/wiki24\/south-african-class-6z-2-6-4\/","about":["Wiki"],"wordCount":5298,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4CGR 6th Class 2-6-4South African Class 6Z 2-6-4CGR 6th Class 2-6-2 Prairie as built, before modification to 2-6-4 AdriaticType and originPower typeSteamDesignerCape Government Railways(H.M. Beatty)BuilderNeilson, Reid and CompanySerial number5867-5870, 6075-6078ModelCGR 6th Class 2-6-4Build date1901Total produced8RebuilderCape Government RailwaysRebuild date1902Number rebuilt4 from 2-6-2 (Prairie)SpecificationsConfiguration:\u200b\u00a0\u2022\u00a0Whyte2-6-4 (Adriatic)\u00a0\u2022\u00a0UIC1’C2’n2tDriver3rd coupled axleGauge3\u00a0ft\u00a06\u00a0in (1,067\u00a0mm) Cape gaugeLeading dia.28+1\u20442\u00a0in (724\u00a0mm)Coupled dia.54\u00a0in (1,372\u00a0mm)Trailing dia.28+1\u20442\u00a0in (724\u00a0mm)Tender wheels37\u00a0in (940\u00a0mm)Wheelbase45\u00a0ft 9+1\u20448\u00a0in (13,948\u00a0mm)\u00a0\u2022\u00a0Engine28\u00a0ft (8,534\u00a0mm)\u00a0\u2022\u00a0Coupled9\u00a0ft 10\u00a0in (2,997\u00a0mm)\u00a0\u2022\u00a0Trailing5\u00a0ft (1,524\u00a0mm)\u00a0\u2022\u00a0Tender10\u00a0ft (3,048\u00a0mm)Wheel spacing(Asymmetrical)1-2: 5\u00a0ft 1\u00a0in (1,549\u00a0mm)2-3: 4\u00a0ft 9\u00a0in (1,448\u00a0mm)Length:\u200b\u00a0\u2022\u00a0Over couplers55\u00a0ft 7+1\u20444\u00a0in (16,948\u00a0mm)Height12\u00a0ft 10\u00a0in (3,912\u00a0mm)Frame typeBarAxle load12\u00a0LT 17\u00a0cwt (13,060\u00a0kg)\u00a0\u2022\u00a0Leading5\u00a0LT 19\u00a0cwt (6,045\u00a0kg)\u00a0\u2022\u00a01st coupled12\u00a0LT 17\u00a0cwt (13,060\u00a0kg)\u00a0\u2022\u00a02nd coupled11\u00a0LT 3\u00a0cwt (11,330\u00a0kg)\u00a0\u2022\u00a03rd coupled12\u00a0LT 1\u00a0cwt (12,240\u00a0kg)\u00a0\u2022\u00a0Trailing12\u00a0LT 8\u00a0cwt (12,600\u00a0kg)\u00a0\u2022\u00a0Tender axleAxle 1: 10\u00a0LT 8\u00a0cwt (10,570\u00a0kg)Axle 2: 10\u00a0LT 15\u00a0cwt (10,920\u00a0kg)Axle 3: 10\u00a0LT 17\u00a0cwt (11,020\u00a0kg)Adhesive weight36\u00a0LT 1\u00a0cwt (36,630\u00a0kg)Loco weight54\u00a0LT 8\u00a0cwt (55,270\u00a0kg)Tender weight32\u00a0LT (32,510\u00a0kg)Total weight86\u00a0LT 8\u00a0cwt (87,790\u00a0kg)Tender typeYE (3-axle)Fuel typeCoalFuel capacity5\u00a0LT 10\u00a0cwt (5.6\u00a0t)Water cap.2,825\u00a0imp\u00a0gal (12,800\u00a0L)Firebox typeRound-top\u00a0\u2022\u00a0Firegrate area25.5\u00a0sq\u00a0ft (2.37\u00a0m2)Boiler:\u200b\u00a0\u2022\u00a0Pitch6\u00a0ft 10\u00a0in (2,083\u00a0mm)\u00a0\u2022\u00a0Diameter4\u00a0ft 7\u00a0in (1,397\u00a0mm)\u00a0\u2022\u00a0Tube plates13\u00a0ft 10+7\u20448\u00a0in (4,239\u00a0mm)\u00a0\u2022\u00a0Small tubes188: 2\u00a0in (51\u00a0mm)Boiler pressure170\u00a0psi (1,172\u00a0kPa)Safety valveRamsbottomHeating surface1,462\u00a0sq\u00a0ft (135.8\u00a0m2)\u00a0\u2022\u00a0Tubes1,366\u00a0sq\u00a0ft (126.9\u00a0m2)\u00a0\u2022\u00a0Firebox96\u00a0sq\u00a0ft (8.9\u00a0m2)CylindersTwoCylinder size18\u00a0in (457\u00a0mm) bore26\u00a0in (660\u00a0mm) strokeValve gearStephensonCouplersJohnston link-and-pinCareerOperatorsCape Government RailwaysSouth African RailwaysClassCGR 6th Class 2-6-4SAR Class 6ZNumber in class8NumbersCGR 270-277, SAR 713-720Delivered1901-1902First run1901Withdrawn1934       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4The South African Railways Class 6Z 2-6-4 of 1901 was a steam locomotive from the pre-Union era in the Cape of Good Hope.In 1901, the Cape Government Railways placed four 6th Class steam locomotives with a 2-6-2 Prairie type wheel arrangement in service. The engines were soon modified to a 2-6-4 Adriatic type wheel arrangement. In 1902, another four locomotives were placed in service, built with the 2-6-4 wheel arrangement. These latter four were the first tender locomotives in the world to be built with this wheel arrangement. In 1912, when they were assimilated into the South African Railways, these eight locomotives were renumbered and designated Class 6Z.[1][2][3][4]       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4The Cape 6th Class 2-6-4 locomotive was designed at the Salt River works of the Cape Government Railways (CGR). It was a further development of the very successful 6th Class 4-6-0 locomotive, based on the experience gained with the several British and American versions of the Class and incorporating features from both. The design began as an experimental redesign of the 6th Class with a bar frame and wide firebox and with a 2-6-2 Prairie type wheel arrangement.[1][5]Table of ContentsBridle casting[edit]Redesign[edit]Characteristics[edit]First Adriatic tenders[edit]South African Railways[edit]Service[edit]Illustration[edit]References[edit]Bridle casting[edit]Good though the 6th Class 4-6-0 locomotives were, the requirement grew for larger and more powerful engines. At the time, it was becoming increasingly apparent that such locomotives would require fireboxes with appreciably larger grate areas. This was not possible with the existing type of frame on a Cape gauge locomotive where the firebox was arranged between the rearmost coupled wheels. Longer fireboxes were impractical since it would be accompanied by greater fatigue to firemen as well as difficulties in design. To arrange the firebox over the coupled wheels would be unsuitable for adoption on larger locomotives, given the limitation on the maximum height of the boiler centreline above the railhead which was in vogue at the time.[1][5]       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4  To overcome this problem, CGR Chief Loco\u00admo\u00adtive Superintendent H.M. Beatty prepared designs for a new locomotive with a 2-6-2 wheel arrangement of which the frame terminated in front of the firebox, where it connected to a casting termed the “bridle casting”. This casting extended out on either side and had wider spaced frames attached to its rear, which allowed a wider and deeper firebox with an interior width of 49+1\u20444 inches (1,251 millimetres).[1][4][5]Because of the widened frames, trailing carrier wheels were incorporated to take the weight of the firebox. Unlike usual practice, they were not arranged as a bissel truck, but the outside axle boxes worked in hornblocks bolted to the frames. The result was that the fixed wheelbase was extended backwards beyond that of the coupled wheels. Since the coupled wheels were also located further forward to accommodate the deeper firebox, the two-axle pilot bogie was replaced by a single axle bissel truck.[1][4]This was the first time that such a method of widening the frame had been used and it proved to be so successful that it was copied widely by both the Natal Government Railways (NGR) and the Central South African Railways (CSAR) in their subsequent locomotive designs. The one disadvantage of the bridle casting was that it proved prone to serious damage in even minor collisions. The design was applied to South African locomotives for many years to come, until boiler centre lines were raised to a height which permitted the main frames to be reduced in depth and therefore to continue right through to the rear buffer beam.[1][4][5]Redesign[edit]The first order for four locomotives was placed with Neilson, Reid and Company in 1901 and delivered in that same year. These locomotives introduced the type YE three-axle tender. They were numbered in the range from 270 to 273 for the Western System of the CGR and subjected to exhaustive testing during which it was found that, while they were good locomotives, they were inclined to be unsteady at speed. The locomotive design was therefore modified by replacing the trailing carrier wheels with a two-axle bogie.[1][5][6]Another four locomotives incorporating this modification were ordered from Neilson, Reid later in 1901. They were numbered in the range from 274 to 277 upon delivery in 1902. The change in design was found to have made a marked improvement in the locomotive’s stability at speed and the first four locomotives were therefore also modified accordingly.[1][5][6]Characteristics[edit]The shell plates of the boiler and firebox were of mild steel, the tubes were of brass and the firebox of copper. The grates were of the finger-bar rocking type. The bar frame was 4+1\u20442 inches (114 millimetres) thick and was machined from solid mild steel slab. Steel castings were provided for the front buffer, knees at the motion plate, spring and compensating beam brackets, axlebox guides, wheel centres and eccentric sheaves. The cylinders were each cast in one piece with half of the boiler saddle.[5]In spite of their totally different appearance and wheel arrangement, the CGR designated these locomotives as 6th Class as well, possibly because they were intended as an “Improved 6th Class”.[7]First Adriatic tenders[edit]The 2-6-4 wheel arrangement was usually used only on tank locomotives, with only three known exceptions. These eight locomotives were the world’s first tender engines with the 2-6-4 wheel arrangement. They remained unique in the world until 1908, when the Austrian KkStB Class 210 express locomotives appeared, followed by their KkStB Class 310 in 1911, both designed by Karl G\u00f6lsdorf. The 2-6-4 type therefore became known as the Adriatic wheel arrangement, named for the Adriatic Sea which bordered Austria-Hungary.[3]South African Railways[edit]When the Union of South Africa was established on 31 May 1910, the three Colonial government railways (CGR, NGR and CSAR) 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 were only implemented with effect from 1 January 1912.[2][8]When they were assimilated into the South African Railways (SAR) in 1912, these locomotives were renumbered in the range from 713 to 720 and designated Class 6Z.[2][7]The rest of the CGR’s 6th Class locomotives, together with the CSAR’s Classes 6-L1 to 6-L3 locomotives which had been inherited from the Oranje-Vrijstaat Gouwerment-Spoorwegen (OVGS) via the Imperial Military Railways (IMR), were grouped into thirteen more sub-classes by the SAR. The 4-6-0 locomotives became Classes 6, 6A to 6H and 6J to 6L, and the 2-6-2 locomotives became Class 6Y.[2][7][9]Service[edit]In SAR service, the eight Class 6Z locomotives gave good service on the Cape mainline and later in suburban service. In their last years, Class 6Z engines were employed to haul mainline passenger trains between Cape Town’s Monument Station and the mailship pier in Table Bay harbour. They were withdrawn and scrapped in 1934.[4][5][7][10]Illustration[edit]No. 717 on the Union Limited at Monument station, c. 1932No. 715 with crew, c. 1930References[edit]^ a b c d e f g h Holland, D.F. (1971). Steam Locomotives of the South African Railways. Vol.\u00a01: 1859\u20131910 (1st\u00a0ed.). Newton Abbott, England: David & Charles. pp.\u00a052\u201354, 56. ISBN\u00a0978-0-7153-5382-0.^ 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. 8, 12, 14, 34 (Reprinted in April 1987 by SATS Museum, R.3125-6\/9\/11-1000)^ a b Durrant, AE (1989). Twilight of South African Steam (1st\u00a0ed.). Newton Abbott: David & Charles. p.\u00a011. ISBN\u00a00715386387.^ a b c d e Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st\u00a0ed.). Cape Town: Struik. p.\u00a045. ISBN\u00a00869772112.^ a b c d e f g h Espitalier, T.J.; Day, W.A.J. (1944). The Locomotive in South Africa – A Brief History of Railway Development. Chapter II – The Cape Government Railways (Continued). South African Railways and Harbours Magazine, February 1944. pp. 97-101.^ a b Neilson, Reid works list, compiled by Austrian locomotive historian Bernhard Schmeiser^ a b c d Holland, D. F. (1972). Steam Locomotives of the South African Railways. Vol.\u00a02: 1910-1955 (1st\u00a0ed.). Newton Abbott, England: David & Charles. p.\u00a0138. ISBN\u00a0978-0-7153-5427-8.^ 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^ Soul of A Railway – System 1 \u2013 Part 2: Cape Town to Wellington (Accessed on 26 November 2016)     (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4"},{"@context":"http:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/#breadcrumbitem","name":"Enzyklop\u00e4die"}},{"@type":"ListItem","position":2,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/south-african-class-6z-2-6-4\/#breadcrumbitem","name":"South African Class 6Z 2-6-4"}}]}]