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| fueltype = Coal | fuelcap = | lubecap = | coolantcap = | watercap = | tendercap = | sandcap = | consumption = | watercons = | electricsystem = | collectionmethod = | primemover = | rpmrange = | enginetype = | aspiration = | displacement = | alternator = | generator = | tractionmotors = | boiler = inside diameter length inside pitch | boilerpressure = | feedwaterheater = | firearea = | tubearea = | fluearea = | tubesandflues = | fireboxarea = | totalsurface = | superheatertype = | superheaterarea = | cylindercount = Two | cylindersize = bore stroke | frontcylindersize= | rearcylindersize = | hpcylindersize = | lpcylindersize = | valvegear = Joy as built Stephenson converted | valvetype = | valvetravel = | valvelap = | valvelead = | transmission = | multipleworking = | maxspeed = | poweroutput = | tractiveeffort = | factorofadhesion = | trainheating = | locobrakes = | locobrakeforce = | trainbrakes = | safety = | operator = Cape Government Railways South African Railways | operatorclass = CGR 4th Class, SAR Class 04 | powerclass = | numinclass = 4 | fleetnumbers = E49-E52 | officialname = | nicknames = | axleloadclass = | locale = | deliverydate = 1884 | firstrundate = 1884 | lastrundate = | retiredate = | withdrawndate = | preservedunits = | restoredate = | scrapdate = | currentowner = | disposition = | notes = }} The Cape Government Railways 4th Class 4-6-0TT of 1884 is a South African steam locomotive from the pre-Union era in the Cape of Good Hope. In 1884 the Cape Government Railways placed four experimental 4th Class tank-and-tender locomotives with a 4-6-0 Tenwheeler type wheel arrangement in service. It was designed by J.D. Tilney, the Locomotive Superintendent of the Cape Eastern System, to be able to use the low-grade local coal with its high content of incombustible matter.〔''C.G.R. Numbering Revised'', Article by Dave Littley, SA Rail May–June 1993, pp. 94-95.〕 ==Stormberg coalfields== The extension of the Eastern System's line from Queenstown reached Sterkstroom in 1883 and passed through the Stormberg coalfields where the Molteno and Cyphergat collieries were operating.〔〔''The South African Railways - Historical Survey''. Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd., Published c. 1978, pp. 12, 25.〕 While the Colonial coal was much cheaper than imported coal, it had a non-combustable content of as high as 29%, which led to difficulties when used in locomotives and frequently caused train delays to allow the firemen to clear the grate of clinker and ash. In attempts to overcome the problem, J.D. Tilney, the Cape Government Railways (CGR) Eastern System's Locomotive Superintendent, carried out many experiments on some of the 4th Class locomotives that had entered service on the Eastern System in 1880 and 1882. The most significant of these experiments involved modifying the boilers and frames to accommodate oscillating firebars and larger fireboxes.〔 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「CGR 4th Class 4-6-0TT 1884」の詳細全文を読む スポンサード リンク
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