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Under the Whyte notation for the classification of steam locomotives, 4-2-2 represents the wheel arrangement of four leading wheels on two axles, two powered driving wheels on one axle, and two trailing wheels on one axle. Other equivalent classifications are: UIC classification: 2A1 (also known as German classification and Italian classification) French classification: 211 Turkish classification: 14 Swiss classification: 1/4 Like other steam locomotive types with single pairs of driving wheels, they were also known as singles. ==History== The 4-2-2 configuration offered designers eight wheels to spread the weight of a larger locomotive, but prior to the introduction of bogies, created a long rigid wheelbase with limited adhesion. As a result, the type was relatively rare until the 1870s. The first steam locomotive made by Borsig of Berlin in 1841, the ''Borsig'' No 1, was an 4-2-2, but the company quickly reverted to the more common 2-2-2 configuration. 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「4-2-2」の詳細全文を読む スポンサード リンク
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