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{{one source|date=July 2016}}
{{Infobox locomotive
{{Infobox locomotive
| name = Southern Pacific class AC-12
| name = Southern Pacific class AC-12
| image = SP4294 Neil916.JPG
| image = Southern Pacific 4294, a cab-forward steam locomotive.jpg
| imagesize = 300
| imagesize = 300
| caption = [[Southern Pacific 4294]] on display at the [[California State Railroad Museum]]
| powertype = Steam
| powertype = Steam
| builder = [[Baldwin Locomotive Works]]
| builder = [[Baldwin Locomotive Works]]
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| builddate = October 1943 – March 1944
| builddate = October 1943 – March 1944
| totalproduction = 20
| totalproduction = 20
| whytetype = [[4-8-8-2]] Articulated
| whytetype = [[4-8-8-2]] simple articulated
| gauge = {{RailGauge|ussg}}
| gauge = {{track gauge|ussg|allk=on}}
| driverdiameter = {{convert|63|in|abbr=on}}
| driverdiameter = {{convert|63|in|0|abbr=on}}
| weightondrivers = {{convert|531700|lb|t|abbr=in}}
| weightondrivers = {{convert|531700|lb|kg t|abbr=on}}
| locoweight = {{convert|657900|lb|t|abbr=in}}
| locoweight = {{convert|657900|lb|kg t|abbr=on}}
| locotenderweight= {{convert|977900|lb|t|abbr=in}}
| locotenderweight= {{convert|977900|lb|kg t|abbr=on}}
| boilerpressure = {{convert|250|psi|MPa|sigfig=3|abbr=on}}
| boilerpressure = {{convert|250|psi|MPa|sigfig=3|abbr=on}}
| feedwaterheater = 6SA Worthington
| feedwaterheater = 6SA Worthington
| cylindercount = Four (simple articulated)
| cylindercount = 4 (simple articulated)
| cylindersize = {{convert|24|×|32|in|abbr=on}} <small>(bore × stroke)</small>
| cylindersize = {{convert|24|×|32|in|0|abbr=on}} <small>([[Bore (engine)|bore]] × [[Stroke (engine)|stroke]])</small>
| tractiveeffort = {{convert|124300|lbf|kN|abbr=on}}
| tractiveeffort = {{convert|124300|lbf|kN|abbr=on}}
| operator = [[Southern Pacific Railroad]]
| operator = [[Southern Pacific Railroad]]
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| firstrundate = October 27, 1943
| firstrundate = October 27, 1943
| retiredate = 1955&ndash;1958
| retiredate = 1955&ndash;1958
| disposition = One preserved ([[Southern Pacific 4294|#4294]]); remainder scrapped
| disposition = One preserved ([[Southern Pacific 4294|#4294]]); remainder [[scrap]]ped
}}
}}
[[Southern Pacific Railroad]]'s '''AC-12''' class of [[cab forward]] [[steam locomotive]]s 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. The locomotives were effectively a conventional 2-8-8-4 locomotive running in reverse; the tender being coupled at the smokebox end of the locomotive. This was made possible by the use of oil-firing.The distinct features of these locomotives include: A steamlined front with white band, an air horn on the front, a steamlined cowcatcher, a SP 12 wheel box tender, & the air compressors are on the smokebox. Southern Pacific used these locomotives all over its system, but they were extremely famous for working on Donner Pass & Cascade Summit.
[[Southern Pacific Railroad]]'s '''AC-12''' class of simple [[articulated locomotive|articulated]] [[4-8-8-2]] [[cab forward]] [[steam locomotive]]s 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. The locomotives were effectively a conventional 2-8-8-4 locomotive running in reverse; the tender being coupled at the smokebox end of the locomotive. This was made possible by the use of oil-firing. The distinct features of these locomotives include: a streamlined front with white band, an air horn on the front, a streamlined pilot, a SP 12 wheel box tender, and air compressors mounted on the smokebox. Southern Pacific used these locomotives all over its system, but they were extremely famous for working on Donner Pass & Cascade Summit.


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 [[Southern Pacific 4294|4294]], was scrapped.
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. Only one AC-12, [[Southern Pacific 4294|SP 4294]], has survived into preservation and is now on display at the [[California State Railroad Museum]].


== References ==
== References ==
{{Commons}}
* {{cite book| author=Diebert, Timothy S. and Strapac, Joseph A.| title=Southern Pacific Company Steam Locomotive Conpendium| publisher=Shade Tree Books| year=1987| isbn=0-930742-12-5}}
* {{cite book|author1=Diebert, Timothy S. |author2=Strapac, Joseph A. |name-list-style=amp | title=Southern Pacific Company Steam Locomotive Conpendium| publisher=Shade Tree Books| year=1987| isbn=0-930742-12-5}}


{{SP cab forward locomotives}}
{{SP cab forward locomotives}}
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[[Category:Railway locomotives introduced in 1943]]
[[Category:Railway locomotives introduced in 1943]]
[[Category:Steam locomotives of the United States]]
[[Category:Steam locomotives of the United States]]
[[Category:Standard gauge locomotives of the United States]]
[[Category:Freight locomotives]]
[[Category:Cab_forward_steam_locomotives]]

Revision as of 23:26, 3 February 2024

Southern Pacific class AC-12
Southern Pacific 4294 on display at the California State Railroad Museum
Type and origin
Power typeSteam
BuilderBaldwin Locomotive Works
Serial number70082–70101
Build dateOctober 1943 – March 1944
Total produced20
Specifications
Configuration:
​
 • Whyte4-8-8-2 simple articulated
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.63 in (1,600 mm)
Adhesive weight531,700 lb (241,200 kg; 241.2 t)
Loco weight657,900 lb (298,400 kg; 298.4 t)
Total weight977,900 lb (443,600 kg; 443.6 t)
Boiler pressure250 psi (1.72 MPa)
Feedwater heater6SA Worthington
Cylinders4 (simple articulated)
Cylinder size24 in × 32 in (610 mm × 813 mm) (bore × stroke)
Performance figures
Tractive effort124,300 lbf (553 kN)
Career
OperatorsSouthern Pacific Railroad
ClassAC-12
Numbers4275–4294
First runOctober 27, 1943
Retired1955–1958
DispositionOne preserved (#4294); remainder scrapped

Southern Pacific Railroad's AC-12 class of simple articulated 4-8-8-2 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. The locomotives were effectively a conventional 2-8-8-4 locomotive running in reverse; the tender being coupled at the smokebox end of the locomotive. This was made possible by the use of oil-firing. The distinct features of these locomotives include: a streamlined front with white band, an air horn on the front, a streamlined pilot, a SP 12 wheel box tender, and air compressors mounted on the smokebox. Southern Pacific used these locomotives all over its system, but they were extremely famous for working on Donner Pass & Cascade Summit.

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. Only one AC-12, SP 4294, has survived into preservation and is now on display at the California State Railroad Museum.

References

Wikimedia Commons has media related to Southern Pacific class AC-12.
  • Diebert, Timothy S. & Strapac, Joseph A. (1987). Southern Pacific Company Steam Locomotive Conpendium. Shade Tree Books. ISBN 0-930742-12-5.
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