The GS-2 was a class of streamlined 4-8-4 "Northern" type steam locomotive operated by the Southern Pacific Railroad (SP) from 1937 to 1958.

The GS-2s were streamlined and designed by Southern Pacific Company for high-speed passenger service in 1935.

Access to the open cab was by two ladders attached to the front of the tender.

[4] They were the first locomotives to receive the silver, black, red, and orange Daylight paint scheme designed by Charles L. Eggleston of the Southern Pacific,[5][6] and were used for the streamlined debut of Southern Pacific's premier passenger train, the Coast Daylight, in 1937.

During World War II, they were painted black and silver and were used to transport troops.