The Butte, Anaconda and Pacific Railway is a short line railroad in the U.S. state of Montana. The BA&P was founded in 1891 and operated as such until sale in 1985, when it was renamed the Rarus Railway. The railway was again sold in May 2007 to the Patriot Rail Corporation, and the name returned to the Butte, Anaconda and Pacific Railway in July 2007. The railway was the main conduit for ore transport between Butte and Anaconda, and was used for filming of portions of the 1985 Golden Globe nominated movie Runaway Train.

Runaway Train is a 1985 American action thriller film directed by Andrei Konchalovsky and starring Jon Voight, Eric Roberts, Rebecca De Mornay and John P. Ryan. The screenplay by Djordje Milicevic, Paul Zindel and Edward Bunker was based on an original 1960s screenplay by Akira Kurosawa, with uncredited contributions by frequent Kurosawa collaborators Hideo Oguni and Ryūzō Kikushima. The film was also the feature debut of both Danny Trejo and Tommy "Tiny" Lister, who both proceeded to successful careers as "tough guy" character actors.