Southern Pacific class GS-3

Infobox Locomotive
name=SP GS-3
powertype=Steam
gauge=4 ft 8½ in (1435 mm)
railroad=Southern Pacific Railroad
railroadclass=GS-3
whytetype=4-8-4
firstrundate=November-December 1937
retiredate=1957
builder=Lima Locomotive Works
roadnumber=4416 – 4429
numinclass=14
driversize=80 inch diameter
boilerpressure=280 psi
tractiveeffort=62,800 lbf, 76,050 lbf with booster
disposition=scrapped
cylindersize=26 in dia × 32 in stroke
weight=460,000 lb
weightondrivers=267,300 lb
builddate=October-December 1937
serialnumber=7721 – 7734
The GS-3 was a streamlined 4-8-4 Northern type steam locomotive that served the Southern Pacific Railroad from 1938 to 1957. 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, teardrop classification lights, and whistles. 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 commute trains, freight service, and made occasional appearances on the "San Joaquin Daylight".

No GS-3 locomotives survive.

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