| 词条 | Southern Pacific class GS-5 |
| 释义 |
| name = Southern Pacific GS-5 | powertype = Steam | image = | alt = | caption = | designer = | builder = Lima Locomotive Works | ordernumber = | serialnumber = 7856, 7857 | buildmodel = | builddate = May–June 1942 | totalproduction = 2 | whytetype = 4-8-4 | uicclass = 2′D2′ h2 | gauge = {{track gauge|ussg|allk=on}} | leadingdiameter = | driverdiameter = {{convert|80|in|mm|0|abbr=on}} | trailingdiameter = | minimumcurve = | wheelbase = | length = | width = | height = | axleload = {{convert|69600|lb|kg t|1|abbr=in|sp=us}} | weightondrivers = {{convert|278700|lb|kg t|abbr=on}} | locoweight = {{convert|483200|lb|kg t|abbr=on}} | tenderweight = | locotenderweight = {{convert|796930|lb|kg t|abbr=on}} | tendertype = | fueltype = Fuel oil | fuelcap = {{convert|6275|usgal|abbr=on}} | watercap = {{convert|23300|usgal|abbr=on}} | sandcap = | boiler = | boilerpressure = {{convert|300|psi|MPa|2|abbr=on}} | feedwaterheater = | firearea = {{convert|388|sqft|m2|abbr=on}} | tubearea = | fluearea = | tubesandflues = | fireboxarea = | totalsurface = {{convert|4890|sqft|m2|abbr=on}} | superheatertype = | superheaterarea = {{convert|1834|sqft|m2|abbr=on}} | cylindercount = Two, outside | cylindersize = {{convert|25+1/2|in|mm|0|abbr=on}}, stroke? | valvegear = Walschaerts | valvetype = | valvetravel = | valvelap = | valvelead = | transmission = | maxspeed = | poweroutput = | tractiveeffort = {{convert|64800|lbf|kN|2|abbr=on}}, {{convert|78000|lbf|kN|2|abbr=on}} with booster | factorofadhesion = | trainheating = | locobrakes = | locobrakeforce = | trainbrakes = | safety = | operator = Southern Pacific | operatorclass = GS-5 | powerclass = | numinclass = | fleetnumbers = 4458, 4459 | officialname = | nicknames = | axleloadclass = | locale = | deliverydate = | firstrundate = June 1942 | lastrundate = | retiredate = 1958 | preservedunits = | restoredate = | scrapdate = | currentowner = | disposition = Both scrapped | notes = }} The GS-5 was a streamlined 4-8-4 Northern type steam locomotive that served the Southern Pacific Company from 1942 to 1958. Two locomotives were built by the Lima Locomotive Works and were numbered 4458 and 4459. GS stands for "Golden State" or "General Service." The GS-5s are identical in appearance to the GS-4s, the only difference being the roller bearings that gave the locomotive a smoother ride and added weight. 4458 had roller bearings from the Timken Company and 4459 used SKF brand roller bearings. They had a silver smokebox with a dual-headlight casing (top headlight was a mars light), and an enclosed, all-weather cab. It retained the skyline casing on the top of the boiler, skirting on the sides, an air horn (for use at speeds due to being louder than the whistle which was rarely if ever used on the main line) and teardrop classification lights. They received the orange and red "Daylight" paint scheme. The GS-5's were designed for high-speed passenger service on Southern Pacific's premier passenger trains, the Coast Daylight, San Joaquin Daylight and Sunset Limited. In later years they were painted black and had their side skirting removed for easier maintenance. The GS-5s were considered the best of the GS series and ended their careers on Southern Pacific's San Joaquin Valley line. Neither of the two GS-5's survive after running well over a million miles. Surviving GS-4 4449 was equipped with roller bearings on the lead truck, trailing truck and tender (But not the main axles or rods) in 2008 and therefore shares some of the same characteristics as a GS-5. The roller bearings on the two GS-5's were so successful that when both #4458 and #4459 were scrapped, they were examined after those many miles and showed minimal wear after all those miles. Locomotive #4458 was known as the pinnacle of steam power on the Southern Pacific Lines, and lasted in service the longest, pulling the ever popular Valley Daylight until late 1956. References
External links
9 : Southern Pacific Railroad locomotives|4-8-4 locomotives|Lima locomotives|Streamlined steam locomotives|Passenger locomotives|Railway locomotives introduced in 1942|Steam locomotives of the United States|Scrapped locomotives|Standard gauge locomotives of the United States |
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