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Noun: iron horse  I(-u)rn hors
Usage: archaic
  1. (c. 1840) an early term for a locomotive
    "The iron horse thundered across the prairie, bringing settlers to the West"

Derived forms: iron horses

Type of: engine, loco [informal], locomotive, locomotive engine, railroad locomotive [N. Amer], railway locomotive [Brit, Cdn]

Encyclopedia: Iron horse