[PAR] [TLE] Southern Pacific class AC-9 [SEP] The AC-9 was one of two Southern Pacific Railroad's articulated steam locomotive class that ran smokebox forward after 1920.  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 these 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 the cab forwards.  The 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. [PAR] [TLE] Sparks, Nevada [SEP] Sparks is a city in Washoe County, Nevada, United States.  It was founded in 1904 and incorporated on March 15, 1905, and is located just east of Reno.  The 2010 U.S. Census Bureau population count was 90,264.  It is the fifth most populous city in Nevada.  It is named after the late Nevada Governor John Sparks, a member of the Silver Party.
[PAR] [TLE] Southern Pacific class AC-9 [ SEP ] The AC-9 was one of two Southern Pacific Railroad 's articulated steam locomotive class that ran smokebox forward after 1920 . 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 these 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 the cab forwards . The 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 . [PAR] [TLE] Sparks , Nevada [ SEP ] Sparks is a city in Washoe County , Nevada , United States . It was founded in 1904 and incorporated on March 15 , 1905 , and is located just east of Reno . The 2010 U.S. Census Bureau population count was 90,264 . It is the fifth most populous city in Nevada . It is named after the late Nevada Governor John Sparks , a member of the Silver Party .
What year did the Southern Pacific class AC-9 begin running between Alturas, CA and Nevada's fifth most populous city?
What year did the Southern Pacific class AC-9 begin running between Alturas , CA and Nevada 's fifth most populous city ?
1952
1952