Southern Pacific class GS-3

Southern Pacific GS-3
Southern Pacific GS-3 locomotives.
Type and origin Power type Steam Builder Lima Locomotive Works Serial number 7721–7734 Build date October–December 1937 Total produced 14
Specifications Configuration: ​  • Whyte 4-8-4  • UIC 2′D2′ h2 Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Driver dia. 80 in (2,032 mm) Axle load 67,000 lb (30,000 kilograms; 30 metric tons) Adhesive weight 267,300 lb (121,200 kg; 121.2 t) Loco weight 460,000 lb (210,000 kg; 210 t) Total weight 818,880 lb (371,440 kg; 371.44 t) Fuel type Fuel oil Fuel capacity 6,010 US gal (22,800 l; 5,000 imp gal) Water cap 22,000 US gal (83,000 l; 18,000 imp gal) Firebox:  • Firegrate area 90.4 sq ft (8.40 m2) Boiler pressure 280 psi (1.93 MPa) Heating surface 4,890 sq ft (454 m2) Superheater: ​  • Heating area 2,565 sq ft (238.3 m2) Cylinders Two, outside Cylinder size 26 in × 32 in (660 mm × 813 mm)
Performance figures Tractive effort 62,800 lbf (279.35 kN), 76,050 lbf (338.29 kN) with booster
Career Operators Southern Pacific Company Class GS-3 Numbers 4416–4429 First run November–December 1937 Retired 1957 Disposition Scrapped

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.