The GS-4 was a streamlined 4-8-4 Northern type steam locomotive used on the Southern Pacific Company from 1941 to 1958. They were built by the Lima Locomotive Works and were numbered 4430 through 4457. GS stands for Golden State or General Service.Unlike the GS-3 the GS-4 had a dual-headlight casing (top headlight was a mars light) on the silver smokebox. Another change was the all-weather cab.
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