The Southern Pacific class AC-9 was a group of twelve articulated steam locomotives that the railroad bought from Lima in 1939. They were designed to burn low grade bituminous coal mined in New Mexico and used the 2-8-8-4 wheel arrangement nicknamed Yellowstone. Unlike the railroad's cab forward engines they ran with coal tenders, and they were partly streamlined with skyline casings borrowed from Lima's GS series 4-8-4 locomotives, which made them the only articulated steam engines given that treatment. They worked freight and some passenger trains between Tucumcari, El Paso and Tucson until 1953, were converted to oil in 1950, and then moved to the Modoc line. All twelve were scrapped between 1953 and 1956.
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Source Southern Pacific class AC-9 (Wikipedia)
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Source Southern Pacific class AC-9 (Wikipedia)
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Source Southern Pacific class AC-9 (Wikipedia)Lead, builderQuote, Lead, builder
The twelve AC-9 class locomotives were purchased from Lima in 1939
Sources
1. Southern Pacific class AC-9 (Wikipedia)
Lead, purchase year
The twelve AC-9 class locomotives were purchased from Lima in 1939
Lead, number built
The twelve AC-9 class locomotives
Lead, locomotive type
The AC-9 was a class of articulated steam locomotive
Lead, power type
The AC-9 was a class of articulated steam locomotive
Final paragraph, fate
All examples were scrapped between 1953 and 1956.
Lead, builder
The twelve AC-9 class locomotives were purchased from Lima in 1939
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