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Southern Pacific Class GS-5 Semi-Streamlined Steam Locomotive
The GS-5 was a streamlined 4-8-4 Northern type steam locomotive that served the Southern Pacific Company from 1942 to 1958. Two locomotives were built by the Lima Locomotive Works and were numbered 4458 and 4459. GS stands for "Golden State" or "General Service."

The GS-5s are identical in appearance to the GS-4s, the only difference being the roller bearings that gave the locomotive a smoother ride and added weight. 4458 had roller bearings from the Timken Company and 4459 used SKF brand roller bearings. They had a silver smokebox with a dual-headlight casing (top headlight was a mars light), and an enclosed, all-weather cab. It retained the skyline casing on the top of the boiler, skirting on the sides, an air horn (for use at speeds due to being louder than the whistle which was rarely if ever used on the main line) and teardrop classification lights. They received the orange and red "Daylight" paint scheme. The GS-5's were designed for high-speed passenger service on Southern Pacific's premier passenger trains, the Coast Daylight, San Joaquin Daylight and Sunset Limited. In later years they were painted black and had their side skirting removed for easier maintenance. The GS-5s were considered the best of the GS series and ended their careers on Southern Pacific's San Joaquin Valley line.

Neither of the two GS-5's survive after running well over a million miles. Surviving GS-4 4449 was equipped with roller bearings on the lead truck, trailing truck and tender (But not the main axles or rods) in 2008 and therefore shares some of the same characteristics as a GS-5. The roller bearings on the two GS-5's were so successful that when both No. 4458 and No. 4459 were scrapped, they were examined afterwards and showed minimal wear in spite of running well over one million miles.

Locomotive No. 4458 was known as the pinnacle of steam power on the Southern Pacific Lines, and lasted in service the longest, pulling the ever popular Valley Daylight until late 1956.

GS-5 Overview
Type and origin
Power type: Steam
Builder: Lima Locomotive Works
Serial numbers: 7856, 7857
Build date: May–June 1942
Total produced: 2

Configuration: 4-8-4
UIC class: 2′D2′ h2
Gauge: 4 ft 8 1⁄2 in standard gauge
Driver diameter: 80 in
Axle load: 69,600 lb
Adhesive weight: 278,700 lb
Loco weight: 483,200 lb
Total weight: 796,930 lb
Fuel type: Fuel oil
Fuel capacity: 6,275 US gal
Water capacity: 23,300 US gal
 • Firegrate area: 388 sq ft
Boiler pressure: 300 psi
Heating surface: 4,890 sq ft
 • Heating area: 1,834 sq ft
Cylinders: Two, outside
Cylinder size: 25 1⁄2 in
Valve gear: Walschaerts
Performance figures
Tractive effort: 64,800 lbf , 78,000 lbf with booster
Operator: Southern Pacific
Class: GS-5
Numbers: 4458, 4459
First run: June 1942
Retired: 1958
Disposition: Both scrapped

See also:

GS-4 Steam Locomotive 

GS-6 Steam Locomotive

Southern Pacific Company

Coast Daylight Passenger Train

Lima Locomotive Works

Streamlined Steam Locomotives

4-8-4 Steam Locomotives


SP GS-5 No. 4458.
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GS-5 No. 4458 was equipped with Timken roller bearings.
SP Daylight logo.
Lima Locomotive Works logo.

GS-5 No. 4458 was equipped with Timken roller bearings.

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Southern Pacific GS-5 No. 4458.

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