Southern Pacific Railroad's AC-12 class of cab forward steam locomotives was the last class of steam locomotives ordered by Southern Pacific. They were built by Baldwin Locomotive Works during World War II, with the first, number 4275, entering service on October 27, 1943, and the last, 4294, on March 19, 1944.

SP used the AC-12s for a little over a decade with the first retirements occurring on April 5, 1955, and the last on September 24, 1958. All but one of this class, number 4294, was scrapped.

Features:

►Sharp Painting and Lettering
►Road Numbers Printed Per Prototype Photos
►Powerful Drive
►Intricate Details
►Micro-Trains Couplers

Tested: These engines are low-geared and run slowly but strongly and surely. One steam locomotive will pull as many cars upgrade as the standard diesel engine, and more than the smaller diesels. A  higher voltage (14-16 volt  power controller will help.

If you note that one of four drive wheel shafts has a rectangular connection and the other one has a triangular connection, that is deliberate. In the prototype, that drive wheel would be moving, as would the connection, which would stretch and extend - hence the triangular piece - and when at rest it would be compacted and rectangular. It was designed by the engineers to give the illusion of movement when the locomotive is moving along the track.  There will be a second run; it will have this piece also.