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Southern Pacific class AC-9 : ウィキペディア英語版 | Southern Pacific class AC-9
The AC-9 was one of two Southern Pacific Railroad's articulated steam locomotive class that ran with a forward smokebox after 1920 (The other articulated locomotives fall into the cab-forward design). Twelve AC-9 class locomotives were built by Lima in 1939 and were Southern Pacific's largest and heaviest steam engines, partly a consequence of low quality coal the engines were designed to burn. The AC-9s were partially streamlined (the only articulated steam engines to be so equipped), having "skyline casings" inspired by Lima's GS series of 4-8-4's, also made for Southern Pacific, and were equipped with coal tenders, unlike cab forwards. Their wheel arrangement was 2-8-8-4, which was nicknamed "Yellowstone". Between 1939 and 1952, all the twelve AC-9 engines were in service between Tucumcari, New Mexico, El Paso, Texas, and Tucson, Arizona, where they mainly pulled freight trains and occasionally also passenger trains such as the ''Golden State Limited''. In 1952, they were converted to burn oil instead of coal, and moved to Southern Pacific's Modoc line between Sparks, Nevada, and Alturas, California, where they worked in freight service from 1953 until retirement in 1956. No AC-9 engine has been preserved. ==External links==
* (The Yellowstone Type Locomotive )
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