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| factorofadhesion = | trainheating = | locobrakes = | locobrakeforce = | trainbrakes = | safety = | operator = Cape Government Railways South African Railways | operatorclass = CGR Karoo Class SAR Class 5A | powerclass = | numinclass = 2 | fleetnumbers = CGR 903-904 SAR 721-722 | officialname = | nicknames = | axleloadclass = | locale = | deliverydate = 1903 | firstrundate = 1903 | lastrundate = | retiredate = | withdrawndate = 1940 | preservedunits = | restoredate = | scrapdate = | currentowner = | disposition = | notes = }} The South African Railways Class 5A 4-6-2 of 1903 is a steam locomotive from the pre-Union era in the Cape of Good Hope. In 1903 the Cape Government Railways placed two Karoo Class steam locomotives with a Pacific type wheel arrangement in passenger service. In 1912, when they were assimilated into the South African Railways, they were renumbered and reclassified to Class 5A.〔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)〕 ==Design== The Karoo Class of the Cape Government Railways (CGR) was the first tender locomotive with a Pacific type wheel arrangement to be introduced in Africa. It was the logical development of the CGR 6th Class 2-6-2 Prairie type that later became the Class 6Y on the South African Railways (SAR). Designed by CGR Chief Locomotive Superintendent H.M. Beatty at the Salt River shops in Cape Town, it was acquired to cope with the increasing weight of passenger trains on the one in eighty gradients between Beaufort West and De Aar.〔 Since Beatty was very cautious about raising the boiler’s centre line to more than twice the rail gauge, or , and in this case also to accommodate the large coupled wheels, he resorted to cutting the boiler shell and installing specially shaped pockets to obtain the required clearance. The locomotive had a bar frame, Stephenson valve gear and used saturated steam.〔〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「South African Class 5A 4-6-2」の詳細全文を読む スポンサード リンク
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