Missouri Pacific 1231 Steam Locomotive - Historic 4-8-2 Mountain Type #1840639 (License: Personal Use)

This black-and-white photograph captures Missouri Pacific Lines locomotive #1231, a 4-8-2 “Mountain” type steam engine built for high-speed passenger service. The locomotive features a large boiler, prominent smokebox, and distinctive tender marked with “Missouri Pacific Lines,” reflecting its operational era in the 1920s-1940s. Visible details include the complex valve gear, multiple cylinders, and handrails that highlight the craftsmanship of American railroading’s golden age.

Used on heritage railway websites, museum exhibits, and historical transportation blogs to illustrate early 20th-century steam technology; matches user intent for researching vintage locomotives, railroad history, or model train references.