| 词条 | 4-8-0+0-8-4 | |||||||||||||||||||||
| 释义 |
| name = 4-8-0+0-8-4 (Double Mastodon) | image = WheelArrangement 4-8-8-4.svg | alt = Diagram of two small leading wheels, eight large driving wheels in two foursomes, each foursome joined by coupling rods, and two small trailing wheels | caption = | image2 = Beyer Garratt 6594.jpg | alt2 = | caption2 = Bengal Nagpur Railway class N No. 815 | hatnote = | UIC/Germany/Italy= 2D+D2 | French/Spanish = 240+042 | Turkish = 46+46 | Swiss = 4/6+4/6, 8/12 from 1920s | Russian = 2-4-0+0-4-2 | date = 1929 | country = India | locomotive = BNR class N | railway = Bengal Nagpur Railway | designer = Beyer, Peacock and Company | builder = Beyer, Peacock and Company | evolvedfrom = | evolvedto = | mainbenefit = | maindrawback = | date2 = | country2 = | locomotive2 = | railway2 = | designer2 = | builder2 = | 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, the {{nowrap|4-8-0+0-8-4}} is a Garratt articulated locomotive. The wheel arrangement is effectively two 4-8-0 locomotives operating back to back, with the boiler and cab suspended between the two engine units. Each engine unit has two pairs of leading wheels in a leading bogie, followed by four coupled pairs of driving wheels and no trailing wheels. Since the 4-8-0 type is known as a Mastodon type, the corresponding Garratt type would be referred to as a Double Mastodon. A similar wheel arrangement exists for Mallet locomotives, but is referred to as 4-8-8-4. OverviewThe {{nowrap|4-8-0+0-8-4}} was the fifth rarest Garratt wheel arrangement, with a total of 26 locomotives constructed. UsageAll the 4-8-0+0-8-4 Garratts were built by Beyer, Peacock and Company for the {{RailGauge|5ft6in|al=on|allk=on}} gauge Bengal Nagpur Railway in India. The first sixteen were designated Class N and were delivered in 1929, while ten more arrived in 1931 and were designated class NM. The locomotives had Belpaire fireboxes and piston valves.[1] Two of the type survive, both of Class N. No. 811 is staged at Kharagpur Workshop, while no. 815 is on display at the National Rail Museum in New Delhi.[1]
References{{Commons category|4-8-0+0-8-4 locomotives|4-8-0+0-8-4|position=left}}1. ^{{Garratt Survivors}} {{Whyte types}}2. ^1 {{Garratt Builders B}} 3. ^{{Garratt Builders O}} 2 : Garratt locomotives|Whyte notation |
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