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In the Whyte notation for the classification of steam locomotives by wheel arrangement, the is an articulated locomotive, usually of the Garratt type. The wheel arrangement is effectively two 0-4-0 locomotives operating back to back, with the boiler and cab suspended between the two power units. Each power unit has no leading wheels, four powered and coupled driving wheels on two axles, and no trailing wheels. A similar arrangement exists for Fairlie, Mallet and Meyer locomotives, but is referred to as 0-4-4-0. Other equivalent classifications are: * UIC classification: B+B (also known as German and Italian classifications) * French classification: 020+020 * Turkish classification: 22+22 * Swiss classification: 2/2+2/2 up to the early 1920s, later 4/4 ==Overview== The first Garratt locomotive, K1, one of two gauge Tasmanian Government Railways K Class locomotives built in 1909, has this wheel arrangement and has been restored to operating condition at the Welsh Highland Railway. This arrangement proved one of the less popular Garratt types, since most Garratt locomotives were larger and more powerful, requiring more pairs of driving wheels to operate within the normal axle load limits, and because leading wheels gave more stability and better tracking to allow faster speeds.〔 In total, 34 Garratts of this type were constructed, seven by Garratt patent holder Beyer, Peacock, mostly for industrial use, and 27 by other builders. The largest user of the type was the ''C.F. Vicinaux du Mayumbe'' in the Belgian Congo, with twenty locomotives built to a gauge by St. Leonard in Belgium.〔〔 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「0-4-0+0-4-0」の詳細全文を読む スポンサード リンク
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