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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 removed from service starting in 1953, and all ten were scrapped by June 1955.

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  • Southern Pacific class AC-4 (en)
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  • 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 removed from service starting in 1953, and all ten were scrapped by June 1955. (en)
foaf:name
  • Southern Pacific class AC-4 (en)
name
  • Southern Pacific class AC-4 (en)
foaf:depiction
  • http://commons.wikimedia.org/wiki/Special:FilePath/Southern_Pacific_forward_cab_mallet_locomotive_4100.jpg
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tractiveeffort
  • , rebuilt (en)
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builddate
  • August–October 1928 (en)
firstrundate
  • October 1928 (en)
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  • Steam (en)
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caption
  • Southern Pacific 4100 and its crew (en)
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has abstract
  • 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 112,760 lbf (501.6 kN); a few years later, limited cutoff was dropped and calculated tractive effort increased to 116,000 lbf (520 kN). The AC-4s were removed from service starting in 1953, and all ten were scrapped by June 1955. (en)
disposition
  • All scrapped (en)
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operatorclass
  • AC-4 (en)
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