| 词条 | CGR Type A 2-6-4T |
| 释义 |
| name = CGR Type A 2-6-4T South African NG 2-6-4T 1902 | image = CGR Type A 2-6-4T no. 31 1902.jpg | alt = | caption = CGR Type A 2-6-4T no. 31, SAR no. NG25 | hatnote = | powertype = Steam | designer = Manning Wardle & Company | builder = Manning Wardle & Company | ordernumber = 51200 | serialnumber = 1564 & 1565 | buildmodel = | builddate = Ex works 3 September 1902 | totalproduction = | rebuilder = | rebuilddate = | numberrebuilt = | whytetype = 2-6-4T (Adriatic) | uicclass = 1'C2'n2t | driver = 2nd coupled axle | gauge = {{Track gauge|2ft|allk=on}} narrow | leadingdiameter = {{convert|22|in|mm|0|abbr=on}} | coupleddiameter = {{convert|33|in|mm|0|abbr=on}} | trailingdiameter = {{convert|22|in|mm|0|abbr=on}} | tenderdiameter = | minimumcurve = | wheelbase = {{convert|20|ft|9|in|mm|0|abbr=on}} | engine total = | leading = | coupled = {{convert|6|ft|mm|0|abbr=on}} | trailing = {{convert|4|ft|mm|0|abbr=on}} | tender total = | tenderbogie = | wheelspacing = | length = | over couplers = {{convert|28|ft|11|in|mm|0|abbr=on}} | over bufferbeams = | pivotcentres = | width = {{convert|7|ft|9|in|mm|0|abbr=on}} | height = {{convert|9|ft|11|in|mm|0|abbr=on}} | frametype = Plate | axleload = {{convert|8|lt|7|lcwt|kg|sigfig=4|abbr=on}} | leadingbogie/pony= | coupled all = | coupled 1 = | coupled 2 = | coupled 3 = | coupled 4 = | coupled 5 = | coupled 6 = | coupled 7 = | coupled 8 = | trail bogie/pony = | tenderbogieload = | tenderaxle = | weightondrivers = | locoweight = {{convert|34|lt|15|lcwt|kg|sigfig=4|abbr=on}} | tenderweight = | locotenderweight = | tendertype = | fueltype = Coal | fuelcap = {{convert|2|lt|t|1|abbr=on}} | watercap = {{convert|1000|impgal|l|sigfig=3|abbr=on}} | tendercap = | sandcap = | boiler = | pitch = {{convert|4|ft|9|in|mm|0|abbr=on}} | boilertype = | diameterinside = {{convert|3|ft|5|in|mm|0|abbr=on}} | lengthinside = | smalltubediameter= | largetubediameter= | fireboxtype = Round-top | boilerpressure = {{convert|180|psi|kPa|0|abbr=on}} | safetyvalvetype = | feedwaterheater = | firearea = {{convert|12|sqft|m2|abbr=on}} | totalsurface = | tubearea = | fluearea = | tubesandflues = | fireboxarea = | superheatertype = | superheaterarea = | cylindercount = Two | cylindersize = {{convert|13|in|mm|0|abbr=on}} bore {{convert|16|in|mm|0|abbr=on}} stroke | frontcylindersize= | rearcylindersize = | hpcylindersize = | lpcylindersize = | valvegear = Walschaerts | valvetype = | valvetravel = | valvelap = | valvelead = | transmission = | trainheating = | locobrakes = Steam brakes | trainbrakes = | safety = | coupling = Bell-and-hook | maxspeed = | poweroutput = | tractiveeffort = {{convert|11062|lbf|kN|abbr=on}} @ 75% | factorofadhesion = | locobrakeforce = | operator = Cape Government Railways South African Railways | operatorclass = Type A | powerclass = | numinclass = 2 | fleetnumbers = CGR 31-32, SAR NG25-NG26 | officialname = | nicknames = | axleloadclass = | locale = | deliverydate = 1902 | firstrundate = 1902 | lastrundate = | withdrawndate = 1929 | preservedunits = | restoredate = | scrapdate = | currentowner = | disposition = | notes = }} The Cape Government Railways Type A 2-6-4T of 1902 was a South African steam locomotive from the pre-Union era in the Cape of Good Hope. In 1902, the Cape Government Railways placed two Type A 2-6-4T Adriatic type narrow gauge steam locomotives in construction service on the Avontuur branch. In 1912, these locomotives were assimilated into the South African Railways and renumbered.[1][2][3][4] Langkloof railwayIn April 1902, authority was granted for the construction of the Langkloof {{nowrap|{{convert|2|ft|mm|0|abbr=off}}}} narrow gauge railway from Port Elizabeth via Humansdorp to Avontuur, a total distance of {{convert|177|mi|km|0|abbr=off}}. It was to become one of the most important narrow gauge railways in South Africa and passed through districts which were famous for general agriculture and the export of wheat and fruit, especially apples. The line was laid with {{convert|35|lb/yd|0|abbr=off}} rail and was completed to Avontuur on 10 December 1906.[2] Coal consumption on the line averaged {{convert|54|lb|kg|0|abbr=off}} per train mile. A load from Port Elizabeth to Avontuur had to be hauled up {{convert|6835|ft|m|0|abbr=off}} and, on the return journey, {{convert|3963|ft|m|0|abbr=off}}. This, in conjunction with the innumerable sharp curves and steep gradients of 1 in 40 (2½%) compensated, prevented a continuous high speed from being attained.[2] ManufacturerTwo 2-6-4 Adriatic type narrow gauge tank steam locomotives were supplied to the Cape Government Railways (CGR) by Manning Wardle and Company in 1902. They were designated Type A and numbered 31 and 32.[1][2][5] It is recorded that these locomotives, during tests, were able to haul a load of {{convert|150|lt|0|abbr=off}} up a 1 in 40 (2½%) grade.[2] ServiceCape Government RailwaysBoth locomotives were placed in construction service on the Avontuur narrow gauge railway and were also used as the first road power on the railway. At a width of {{convert|7|ft|9|in|mm|0|abbr=off}}, they were extremely large and were the widest locomotives to see service on any of the {{convert|2|ft|mm|abbr=off}} narrow gauge lines in South Africa.[1][6] South African RailwaysWhen 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. 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.[4][7] The two locomotives were renumbered to NG25 and NG26 on the South African Railways (SAR), with the NG prefix identifying them as narrow gauge locomotives in the SAR registers. They remained in service on the Avontuur branch for the duration of their service lives, until they were withdrawn in 1929 without having been classified by the SAR.[1] References{{Commons category|CGR Type A 2-6-4T|position=left}}1. ^1 2 3 {{Paxton-Bourne|pages=112, 156}} {{Locomotives of the Cape Government Railways}}{{Locomotives of South Africa}}2. ^1 2 3 4 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, April 1944. pp. 253-257. 3. ^{{Dulez 150|page=232}} 4. ^1 Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer's Office, Pretoria, January 1912, p. 47 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000) 5. ^Harman, Fred W. The Locomotives built by Manning Wardle & Company. Volume 3 Broad Gauge & Works List (1st ed. (undated)). Century Locoprints, Bridlington, UK. p.77. {{ISBN|0 9535313 2 5}}. 6. ^[https://sites.google.com/site/soulorailway/home/system-3-1/system-3 Soul of A Railway - System 3: Cape Midland, based in Port Elizabeth – Part 1: The Port Elizabeth Narrow Gauge – Introduction - Captions 3 & 4] (Accessed on 10 December 2016) 7. ^The South African Railways - Historical Survey. Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd., Published c. 1978, p. 25. 8 : CGR locomotives|1C2 locomotives|2-6-4T locomotives|Manning Wardle locomotives|2 ft gauge locomotives|Railway locomotives introduced in 1902|1902 in South Africa|Scrapped locomotives |
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