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Four new Southern Pacific GS-3 Class locomotives on display, circa 1937.

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Southern Pacific Class GS-3 Semi-Streamlined Steam Locomotive
The GS-3 was a streamlined 4-8-4 Northern type steam locomotive that served the Southern Pacific Company from 1938 to 1957-1968. They were built by Lima Locomotive Works and were numbered 4416 through 4429. GS stands for "Golden State" or "General Service."

The GS-3 had an appearance similar to the GS-2. The GS-3s were streamlined and designed for high-speed passenger service. Like the GS-2, they featured a silver smokebox with a cone-shaped single headlight casing, skyline casing on the top of the boiler, skirting on the sides, an air horn to supplement the whistle and teardrop classification lights. The only major difference in appearance was the increase in driver size.

They received the orange and red "Daylight" paint scheme. They were primarily used on Southern Pacific's premier passenger train at the time, the Coast Daylight. In later years after being replaced by newer GS class engines, they were painted black, had their side skirting removed for easier maintenance, and were reassigned to the San Jose-San Francisco commuter trains, freight service, and made occasional appearances on the San Joaquin Daylight.

GS-3 Overview
Type and origin
Power: type Steam
Builder: Lima Locomotive Works
Serial numbers: 7721–7734
Build date: October–December 1937
Total produced: 14

Specifications
Configuration: 4-8-4
UIC class: 2′D2′ h2
Gauge: 4 ft 8 1⁄2 in standard gauge
Driver diameter: 80 in
Axle load: 67,000 lb
Adhesive weight: 267,300 lb
Loco weight: 460,000 lb
Total weight: 818,880 lb
Fuel type: Fuel oil
Fuel capacity: 6,010 US gal
Water capacity: 22,000 US gal
Firebox:
 • Firegrate area: 90.4 sq ft
Boiler pressure 280 psi
Heating surface: 4,890 sq ft (454 m2)
Superheater:​
 • Heating area: 2,565 sq ft
Cylinders: Two, outside
Cylinder size :26 in × 32 in

Performance figures
Tractive effort 62,800 lbf, 76,050 lbf with booster

Career
Operator: Southern Pacific Company
Class: GS-3
Numbers: 4416–4429
First run: November–December 1937
Retired: 1957
Disposition: All Scrapped

See also:

Daylight Passenger Train

Southern Pacific

SP GS-2 Locomotive

SP GS-4 Locomotive

Streamlined Steam Locomotives

4-8-4 Northern Locomotives

Steam Locomotives

Four new Southern Pacific GS-3 Class locomotives on display, circa 1937.
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