词条 | 2-6-6-2 |
释义 |
| name = 2-6-6-2 | image = WheelArrangement 2-6-6-2.svg | alt = Diagram of one small leading wheel, two trios of large driving wheels with each trio joined by a coupling rod, and one small trailing wheel | caption = | image2 = MD Mallett 1001.jpg | alt2 = | caption2 = CSAR experimental Mallet, SAR Class MD | hatnote = | UIC/Germany/Italy= (1C)C1, (1'C)C1' | French/Spanish = 130+031 | Turkish = 34+34 | Swiss = 3/4+3/4 | Russian = 1-3-0+0-3-1 | date = | country = | locomotive = | railway = | designer = | builder = | evolvedfrom = | evolvedto = | mainbenefit = | maindrawback = | date2 = 1910 | country2 = South Africa | locomotive2 = SAR Class MD | railway2 = Central South African Railways | designer2 = American Locomotive Company | builder2 = American Locomotive Company | evolvedfrom2 = | evolvedto2 = | mainbenefit2 = | maindrawback2 = | date3 = | country3 = | locomotive3 = | railway3 = | designer3 = | builder3 = | evolvedfrom3 = | evolvedto3 = | mainbenefit3 = | maindrawback3 = }} Under the Whyte notation for the classification of steam locomotives by wheel arrangement, a {{nowrap|2-6-6-2}} is a locomotive with one pair of unpowered leading wheels, followed by two sets of three pairs of powered driving wheels and one pair of trailing wheels. The wheel arrangement was principally used on Mallet-type articulated locomotives, although some tank locomotive examples were also built. A Garratt type locomotive with the same wheel arrangement is designated {{nowrap|2-6-0+0-6-2}}. Under the UIC classification the wheel arrangement is referred to as (1'C)C1' for Mallet locomotives. OverviewThe 2-6-6-2 wheel arrangement was most often used for articulated compound steam Mallet locomotives. In a compound Mallet, the rear set of coupled wheels are driven by the smaller high pressure cylinders, from which spent steam is then fed to the larger low pressure cylinders that drive the front set of coupled wheels.[1][2][3] This type of locomotive was commonly used in North America on logging railroads. The 2-6-6-2 wheel arrangement was also used in South Africa and the Soviet Union. UsageSerbiaThe Serbian government used a Mallet articulated compound locomotive for freight service on {{Track gauge|2ft6in}} narrow gauge. It was built for the Serbian government by the American Locomotive Company (ALCO). South AfricaThe South African Railways (SAR) operated 22 Mallet locomotives with this wheel arrangement, spread over five classes, all of them built to {{Track gauge|Cape|allk=on}}.
Soviet UnionThe wheel arrangement also appeared in Soviet Russia as a {{Track gauge|5ft|allk=on}} locomotive, the P34, built by Kolomna Locomotive Works. It was a modern but compact Mallet of which only one was built. References{{Commons category|2-6-6-2 locomotives|2-6-6-2|position=left}}1. ^Compounding Steam Engines {{Whyte types}}{{Rolling stock of Russia}}2. ^1 2 3 {{Holland-Vol 1|pages=54-56, 103-105, 138–140}} 3. ^1 2 3 4 5 {{Paxton-Bourne|pages=86-87}} 4. ^1 2 3 4 {{Holland-Vol 2|pages=16–19, 30-32, 140}} 5. ^1 2 3 Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer’s Office, Pretoria, January 1912, pp. 9, 12, 15-16, 46-47 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000) 6. ^1 North British Locomotive Company works list, compiled by Austrian locomotive historian Bernhard Schmeiser 2 : 2-6-6-2 locomotives|(1C)C1 locomotives |
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