The Southern Pacific GS-4 is a class of streamlined 4-8-4 "Northern" type steam locomotive operated by the Southern Pacific Railroad (SP) from 1941 to 1958. A total of twenty-eight were built by the Lima Locomotive Works, numbered 4430 through 4457. GS stands for "Golden State" or "General Service." History Unlike the GS-3, the GS-4 had a dual-headlight casing (the top headlight was a mars light) on the silver smokebox. Another change was the all-weather cab. It retained the skyline casing atop the boiler, skirting on the sides, an air horn to supplement the whistle, and teardrop classification lights. They carried the orange and red "Daylight" paint scheme. The GS-4s were passenger engines capable of , though timetable speed limit never exceeded (the maximum speed allowed in the Salinas Valley). Southern Pacific's premier passenger trains were pulled by GS-4s: the Coast Daylight, San Joaquin Daylight, Lark, Cascade, Golden State, and the Sunset Limited. During wartime and in the first years after the war, some of the GS-4 locomotives were painted black; by 1948 all had been repainted Daylight colors. Between 1947 and 1956 most were painted black again, had their side skirts removed for easier maintenance, and were reassigned to the San Jose-San Francisco Peninsula Commute service, freight service, and the occasional San Joaquin Daylight (steam locomotives remained on that train as late as 1956, which made it the last streamliner train to be pulled by steam on the Southern Pacific) until the were replaced by diesel locomotives. GS-4 No. 4443 pulled one of the final steam excursions on the Southern Pacific in 1957. A GS-4 pulled its last passenger train in October 1958, and they were all retired by the end of the year. The tender of No. 4444 (the last GS-4 to be scrapped) was rebuilt by SP and used as a "hammer car" to test impacts on hydracushion boxcars; it was scrapped in the early 1970s. Accidents and Incidents In the days of steam, Southern Pacific GS-4 No. 4446 had collided with the Lark in the siding at Donner Pass (the date is a complete mystery) Preservation Southern Pacific 4449 is the only surviving GS-4 locomotive and is one of the most recognizable locomotives of all time. It was donated to the City of Portland in 1958 and moved to Oaks Amusement Park for static display, where it was repeatedly vandalized and had many of its external parts