It was used to pull the Southern Pacific's premier passenger trains such as the Coast Daylight, San Joaquin Daylight, Lark, Cascade, Golden State and Sunset Limited.
During wartime it was painted black; by 1948 it has been repainted into Daylight colors.
In 1958, it was retired from service and subsequently scrapped.
- The tender of the locomotive was rebuilt by SP and used as a "hammer car" to test impacts on hydracushion boxcars; it was scrapped in the early 1970's.
- This locomotive was the last GS-4 to be cut up.
- In the 1950's it double-headed with a GS-4 locomotive.
- The locomotive also did freight service.