The AC-9 was one of two Southern Pacific Railroad's articulated steam locomotive classes 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.

In 1939 the SP received 12 Yellowstones from Lima for use throughout the southern part of the SP system. Unlike the Cab Forwards, the class AC-9 locomotives were built as coal burners. They were later converted to burn oil.

© Gene Deimling - A most unique locomotive in the SP scheme on things. The AC-9 was built 'backwards' to the cab forwards. This shot was taken in Sparks in the early 1950s.

The AC-9 locomotive was one of two classes of articulated locomotives that the SP ran and operated smokebox forward. Twelve engines were built by Lima in 1939. This class of engine was one of the heaviest and largest classes operated by the SP.

Sep 28, 2024 · The Southern Pacific employed theirs, classified as AC-9s and built by Lima, in the railroad’s southern regions where grades could be stiff but not brutal like in the Sierras (of note Espee’s famous Cab Forwards were essentially a backward facing Yellowstone and were used exclusively in the Sierras where the many tunnels and snow sheds ...

While most of Southern Pacific's later articulated locomotives were Cab Forwards, the twelve AC-9s were of conventional design. Since there were no tunnels to pass through on the line from Tucumcari, New Mexico to El Paso, Texas, they were able to burn coal in the usual way.

Opening Turret Hatches, Cab Doors and Sliding Cab Vents are just few of the many details on this scale model.The Large 9000 Series Pittman motor and Sunset’s “Quiet Drive” Mechanism powers the all sprung drivers and wheels around your layout with grace, while the improved Railsounds and TMCC in 3 Rail will astound you.

Jan 28, 2009 · Even easier is to google Southern Pacific Articulated Steam Locomotives, it will take you to a site with an enormous number of photos of the 3800’s. A really handsome loco, both in its original incarnation as a coal-burner in New Mexico, and …

Six official railroad speeds with CrewTalk dialog. DynaChuff™ synchronized with 32 levels of intensity as the locomotive gains speed. LEGACY® "Real-Time Quilling Horn" control with instant response for realistic signature "quilling" and correctly timed warning signals. Single hit or continuous bell sounds.