Southern Pacific class AC-4
Template:One source Script error: No such module "Infobox".Template:Template otherScript error: No such module "Check for unknown parameters". Southern Pacific Railroad's AC-4 (meaning Articulated Consolidation) class of steam locomotives was the first class of 4-8-8-2 cab forward locomotives. They were intended to improve on the railroad's MC (Mallet-Consolidation) class 2-8-8-2 locomotives with a larger firebox, hence, the four-wheel leading truck (instead of the two-wheel).
The AC-4s were the first SP Mallets built for simple expansion. Baldwin Locomotive Works built them in August through October 1928 with a maximum cutoff of 70%, so tractive effort was rated at Template:Convert; a few years later, limited cutoff was dropped and calculated tractive effort increased to Template:Convert.
The AC-4s were removed from service starting in 1953, and all ten were scrapped by June 1955.
References
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- Southern Pacific Railroad locomotives
- 4-8-8-2 locomotives
- Baldwin locomotives
- Simple articulated locomotives
- Railway locomotives introduced in 1928
- Steam locomotives of the United States
- Scrapped locomotives
- Standard-gauge locomotives of the United States
- Freight locomotives
- Cab forward steam locomotives