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A 4-4-2+2-4-4, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a Garratt articulated locomotive. The wheel arrangement is effectively two 4-4-2 locomotives operating back to back, with each power unit having four leading wheels on two axles in a leading truck, four powered and coupled driving wheels on two axles, and two trailing wheels on one axle in a trailing truck. Since the 4-4-2 type is usually known as an Atlantic, the corresponding Garratt type is often referred to as a Double Atlantic. Other equivalent classifications are: * UIC classification: 2B1+1B2 (also known as German and Italian classifications) * French classification: 221+122 * Turkish classification: 25+25 * Swiss classification: 2/5+2/5 up to the early 1920s, later 4/10 ==Overview== This was not a common Garratt wheel arrangement. Only ten were built by Beyer, Peacock and Company, owner of the Garratt patent, and none by any other builder.〔 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「4-4-2+2-4-4」の詳細全文を読む スポンサード リンク
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