The Iron Horse is a 1924 American Western silent film directed by John Ford and produced by Fox Film. In 2011, this film was deemed "culturally, historically, or aesthetically significant" by the United States Library of Congress and selected for preservation in the National Film Registry. In choosing the film, the Registry said that The Iron Horse "introduced to American and world audiences a reverential, elegiac mythology that has influenced many subsequent Westerns."
Among the extras used in the Central Pacific sequences were serval Chinese playing coolies who worked on the railroad. They were in fact retired Central Pacific Railroad employees who had helped build the first transcontinental railroad through the Sierras, who came out to participate in the filming as a lark.