Southern Pacific class AC-9
- Southern Pacific class AC-9
The AC-9 was the Southern Pacific Railroad's only articulated steam locomotive class that ran smokebox forward after 1920. Twelve AC-9 class locomotives were built by Lima in 1939. The AC-9s were partially streamlined, having skyline casings, unlike the cab forwards. Wheel arrangement was 2-8-8-4, nickname "Yellowstone".
External links
* [http://www.steamlocomotive.com/yellowstone/#sp The Yellowstone Type Locomotive]
* [http://www.youtube.com/watch?v=Jtre7iwiX8U YouTube video of a model AC-9]
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