Tags: Locomotive.
Southern Pacific Railroad’s AC-6 class of steam locomotives was the third of the railroad’s classes built with a 4-8-8-2 wheel arrangement. Like the earlier AC-4 and AC-5 classes the AC-6 class were cab forward locomotives. The AC-6 was slightly larger than the previous classes with a higher boiler pressure and tractive effort rating.In 1947 and 1948 this class was rebuilt with cast steel frames increasing the overall weight to 648000 lb (with 523600 lb on the drivers).