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Western Pacific "War Baby" No. 481.

SP Class GS-6 and WP GS-64-77 Semi-Streamlined Steam Locomotive
The GS-6 is a semi-streamlined 4-8-4 Northern type steam locomotive that served the Southern Pacific Railroad from 1943 to 1958 and the Western Pacific Railroad from 1943 to 1953. They were built during World War II for the Southern Pacific Railroad by the Lima Locomotive Works and were numbered 4460 through 4469 for Southern Pacific and 481 through 486 for Western Pacific. GS stands for "Golden State" or "General Service."

History
In 1943 when the Southern Pacific Railroad placed an order for fourteen new "Daylight" locomotives from Lima, World War II was raging, and the War Production Board dictated what types of locomotives could be manufactured. SP's order was turned down, with the government declaring that streamlined passenger engines were not necessary and would not help in moving wartime traffic. Southern Pacific re-designed the engines for general service and it was finally approved. The smaller and power-starved Western Pacific Railroad was also looking for locomotives at the time and had first requested diesels, then a different style of steam locomotive. The War Production Board instead diverted six GS-6s (reportedly to have been numbered SP 4470-4475) to the WP. SP patented items were not included and the WP requested Franklin boosters be installed, making them slightly different from the SP engines upon delivery. The WP referred to them as GS-64-77s.

The GS-6 looked similar to the GS-2 with a silver smokebox with a cone-shaped single headlight casing and 73-inch drivers. Like all GS engines they had teardrop classification lights and an air horn to supplement their whistle. They retained the skyline casing on the top of the boiler but did not have the side skirting of previous GS locomotives. Southern Pacific's GS-6s also lacked the orange and red "Daylight" paint scheme that the previous GS engines so famously wore. Western Pacific's GS-6s received "elephant ears" similar to that of the Union Pacific Railroad's 4-8-4 locomotives.

The GS-6s were used by Southern Pacific for the San Joaquin Daylight, as well as San Jose-San Francisco commuter trains and freight service.

The Western Pacific used its GS-6s (GS-64s as WP classified them) on passenger trains and in freight service as well. They acquired a different look from their SP sisters when the WP applied the "elephant ear" style smoke deflectors to all six locomotives. When the Western Pacific dieselized in 1953 they sold three GS-64 engines (WP 481, 484 and 485) to Southern Pacific for spare parts, but kept the tenders and converted them to steam generators for rotary snowplows.

Preservation
One GS-6 survives today, Southern Pacific 4460, which pulled the final movement of steam on the Southern Pacific Railroad in 1958. It was donated to the Museum of Transportation in St. Louis, Missouri, where it has remained ever since. Also, the tender of Western Pacific GS-6 484, which was used in its final years as a water and fuel tank for a rotary snowplow, is stored at the Western Pacific Railroad Museum in Portola, California.

GS-6 Overview
Type and origin
Power type: Steam
Builder: Lima Locomotive Works
Serial number SP: 8013–8016, 8248–8253. WP: 8017–8022
Build date: July-August 1943
Total produced: 16

Specifications
Configuration: 4-8-4
UIC class: 2′D2′ h2
Gauge: 4 ft 8 1⁄2 in standard gauge
Driver diameter: 73 1⁄2 inches
Axle load: 67,900 lb
Adhesive weight: 283,200 lb
Locomotive weight: 468,400 lb
Total weight: 786,200 lb
Firebox:
 • Firegrate area: 90 sq ft
Boiler pressure: 260 psi
Heating surface: 4,582 sq ft
Superheater:​
 • Heating area: 2,086 sq ft
Cylinder size: 27 in × 30 in
Valve gear: Walschaerts
Performance figures
Tractive effort: 64,600 lbf , 76,050 lbf  with booster
Career
Operators: Southern Pacific and Western Pacific
Class: SP: GS-6, WP: GS-64-77.
Number in class: SP:10, WP: 6
Numbers: SP 4460–4469, WP 481–486
Nicknames: "War Babies", "Baby Daylights"
First run: 1943
Retired: 1953 (WP), 1958 (SP)
Disposition: SP 4460 preserved, remainder scrapped

See also:

GS-5 Locomotive

Streamlined Steam Locomotives

A book about the GS-6 is available at: http://www.quickpicbooks.com/files/SP_GS6book.html

Steam Locomotives

Locomotives

Southern Pacific

Western Pacific

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Western Pacific No. 481.
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Southern Pacific 4460 at the Museum of Transportation.

A GS-6 Slideshow.

Southern Pacific GS-6 No. 4460 at the Museum of Transportation.

By Hellbus - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=11761906