Southern Pacific 4460

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Southern Pacific 4460
SP No. 4460 on static display at the National Museum of Transportation
Type and origin Power type Steam Builder Lima Locomotive Works Serial number 7812 Build date July 1943
Specifications Configuration: ​  • Whyte 4-8-4 Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Driver dia. 73+1⁄2 in (1,867 mm) Adhesive weight 283,000 lb (128,000 kg) Loco weight 468,400 lb (212,500 kg) Total weight 867,500 lb (393,500 kg; 393.5 t) Fuel type Bunker oil Boiler pressure 260 psi (1,800 kPa) Cylinder size 27 in × 30 in (686 mm × 762 mm) dia × stroke
Performance figures Tractive effort 65,759 lbf (292,510 N), 76,050 lbf (338,300 N) with booster
Career Operators Southern Pacific Class GS-6 Number in class 10 Numbers SP 4460 Nicknames "War Baby", "Black Daylight", "The Forgotten Daylight", "Blacklight" Retired October 1958 Preserved April 16, 1959 Current owner National Museum of Transportation Disposition On static display

Southern Pacific 4460 is the only surviving class "GS-6" steam locomotive, together with "GS-4" class Southern Pacific 4449, which is operational in excursion service. The GS-6 is a semi-streamlined 4-8-4 "Northern" type steam locomotive. GS stands for "Golden State" or "General Service". The locomotive was built by the Lima Locomotive Works (LLW) for the Southern Pacific Railroad (SP) in 1943. The GS-6 lacked side skirting and red and orange "Daylight" paint found on previous locomotives of the GS class and were painted black and silver instead. The War Production Board controlled locomotive manufacturers during World War II and had turned down Southern Pacific's order of fourteen new Daylight locomotives in 1942. Southern Pacific re-designed the new fleet based on the older GS-2s, only with 260 psi instead of 300 psi, an all-weather cab, and a new GS-4 style tender. The design was finally approved, but the War Production Board reassigned four to the smaller and power-starved Western Pacific Railroad (only the tender from Western Pacific GS6/64 #484 remains). Their smaller size when compared to previous GS class locomotives and the fact that they were built during World War II earned them the nicknames "War Babies".

No. 4460 was built in July 1943 and was used during World War II and after.^[1] It derailed in 1956 ^[2] but returned to service. The engine was the first GS-6 ever manufactured and is famous for pulling the last steam-powered passenger train and being the last operational steam locomotive on the Southern Pacific Railroad in October 1958.^[1] That final run was from Sacramento, California to Sparks, Nevada, and return, with no diesel assistance except for when No. 4460 developed a hot bearing. A local Boy Scout Bugler from the Bay Area Council, played taps for the funeral of the No. 4460, staged by the Southern Pacific Railroad.

Following the final excursion, No. 4460 was donated to the National Museum of Transportation in St. Louis, Missouri, on April 16, 1959, where the engine has since sat along with many other historic steam and diesel locomotives from around the country. Besides having the nicknames "Black Daylight" and "War Baby", it is also known as the "Forgotten Daylight" as it has not seen the fame locomotive No. 4449 has had when that engine was restored to operating condition back in 1975.

• Diebert, Timothy S. & Strapac, Joseph A. (1987). Southern Pacific Company Steam Locomotive Conpendium. Shade Tree Books. ISBN 0-930742-12-5.

Wikimedia Commons has media related to Southern Pacific 4460.

• Museum of Transportation
• Friends of SP 4449