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In 1930 the Baltimore & Ohio became the first railroad to adopt the bay window style as its standard caboose; it never purchased another cupola model. During the same decade, the Milwaukee Road and the Northern Pacific built substantial bay window fleets as well.
But it was immediately after World War II that the bay window design became widespread, as car heights increased significantly and cupolas became less and less useful. As with diesels and other modern freight cars, these postwar bay window cabooses were part of the shift away from customized, railroad-specific locos and cars toward standardized designs produced in large quantities on efficient assembly lines. Key builders of bay window cabooses included International Car Company and American Car & Foundry.