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Southern Pacific class AC-4 : ウィキペディア英語版 | Southern Pacific class AC-4
Southern Pacific Railroad's AC-4 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 class 2-8-8-2 locomotives with a larger firebox. 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 ; a few years later limited cutoff was dropped and calculated tractive effort increased to . The AC-4s were removed from service starting in 1953 and all ten were scrapped by June 1955. == References ==
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