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from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Under the Whyte notation system, a steam locomotive that has a single-axle leading truck followed by four powered driving axles, and no trailing wheels. It's popular name is "Consolidation" as its appearance coincided with the consolidation of several Eastern coal railroads. The Consolidation was extremely popular, especially in the first quarter of the 20th century.