Under the Whyte notation for the classification of steam locomotives, 2-10-0 represents the wheel arrangement of two leading wheels on one axle, ten powered and coupled driving wheels on five axles, and no trailing wheels. This arrangement, popular mainly in Europe, particularly in Germany and in Russia, was often named Decapod, especially in the United States. Here were built the first such locomotives in 1867, but the first boost in the number of Decapods occurred when Russia ordered approximately 1,200 during WWI.
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