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About 2-10-4

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Under the Whyte notation for the classification of steam locomotives, a 2-10-4 locomotive has two leading wheels, ten driving wheels (in other words, five driven axles), and four trailing wheels. These were referred to as the Texas type in most of the United States, the Colorado type on the Burlington Route and the Selkirk type in Canada. Other equivalent classifications are: The 2-10-4 originated and was principally used in the USA. The evolution of this locomotive type began as a 2-10-2 "Santa Fe" type with a larger four wheeled trailing truck that would allow an enlarged firebox. A subsequent development was as a longer 2-8-4 "Berkshire" type that required extra driving wheels to remain within axle loading limits. Examples of both of these evolutionary progressions can be found. Some 2-10-4 tank locomotives also existed in eastern Europe. One bizarre experimental 2-10-4, built in the Soviet Union, had an opposed piston drive system. Outside North America, the 2-10-4 was rare. The Central Railway of Brazil, however, ordered seventeen narrow gauge (metre gauge) 2-10-4 locomotives, ten from Baldwin which were delivered in 1940, and another seven from the American Locomotive Company

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