| Southern Pacific GS-1 class | |
| Powertype: | Steam |
| Builder: | Baldwin Locomotive Works |
| Serialnumber: | T&NO: 61390–61391, 61408–61409 SP: 61410–61415, 61430–41433 |
| Builddate: | May–July 1930 |
| Totalproduction: | 14 |
| Whytetype: | 4-8-4 |
| Uicclass: | 2′D2′ h2 |
| Driverdiameter: | NaN0NaN0 |
| Wheelbase: | 88.230NaN0 |
| Axleload: | 67000abbr=inNaNabbr=in |
| Weightondrivers: | 262000lb |
| Locoweight: | 442300lb |
| Locotenderweight: | 733300lb |
| Fueltype: | Fuel oil |
| Fuelcap: | 4690usgal |
| Watercap: | 16150usgal |
| Boilerpressure: | 2502NaN2, formerly 2102NaN2 |
| Feedwaterheater: | Worthington Type S, No. 5 |
| Firearea: | 90.2square feet |
| Fireboxarea: | 356square feet |
| Totalsurface: | 4858square feet |
| Superheaterarea: | 2565square feet |
| Cylindercount: | Two, outside |
| Cylindersize: | 27x |
| Valvegear: | Walschaerts |
| Valvetype: | Piston |
| Tractiveeffort: | 622002NaN2, 759102NaN2 with booster |
| Factorofadhesion: | 4.14 |
| Operator: | Southern Pacific Texas and New Orleans |
| Operatorclass: | GS-1 |
| Fleetnumbers: | SP: 4400–4409, 4470–4473 T&NO: 700–703, 704–710 |
| Retiredate: | SP: 1959 T&NO: 1953 |
| Disposition: | All scrapped |
| Notes: | References:[1] |
The Southern Pacific GS-1 was a class of conventional 4-8-4 "Northern" type steam locomotive operated by the Southern Pacific Railroad (SP) and its Texas subsidiary the Texas and New Orleans Railroad (T&NO) from 1930 to 1956. A total of fourteen were built by the Baldwin Locomotive Works, numbered 4400 through 4409 by SP and 700 through 703 by T&NO.
During the Great Depression in the 1930s, the Southern Pacific Railroad (SP) needed more power for their heavy passenger train service.[2] [3] They ordered a batch of fourteen 4-8-4 GS-1 locomotives from the Baldwin Locomotives Works between May and July 1930.[1] The prefix GS indicates Golden State.[3] Originally, the GS-1s' operating boiler pressure was 2102NaN2, but would eventually increase to 2502NaN2.[1] The GS-1s were the first SP steam locomotives to have the cylinders connected to the frame in one piece.[1] These locomotives operated on saturated steam for the injector, steam heat, hydrostatic lubricator, power reverser; and superheated steam for the oil-burning equipment, feedwater heater pumps, air pumps, booster, and whistle.[1] They were designed to traverse through curves as sharp as 18 degrees.[1]
The first four locomotives, Nos. 700-703, were assigned to the Texas and New Orleans (T&NO) subsidiary, while the last ten, Nos. 4400-4409, were built for SP's main fleet.[1] The GS-1s were assigned to various passenger trains throughout the SP system, and ended their careers on the San Jose-San Francisco Peninsula Commute service.
No GS-1 locomotives survive.
| Built date | Serial number | First run date | Scrapped date | Notes | |
|---|---|---|---|---|---|
| 700 | May 1930 | 61390 | August 12, 1930 | May 31, 1956 | Originally No. 700 from T&NO in December 1952 as SP's second No. 4403 replacement in March 1953. Renumbered again as SP's second No. 4470 in July of that year. |
| 701 | May 1930 | 61391 | August 13, 1930 | January 20, 1956 | Originally No. 701 from T&NO in January 1953, became SP's second No. 4471 in July of that year. |
| 702 | June 1930 | 61408 | August 8, 1930 | July 9, 1956 | Originally No. 702 from T&NO in January 1953, became SP's second No. 4404 in April of that year. Renumbered again as No. 4472 three months later. |
| 703 | June 1930 | 61409 | August 7, 1930 | February 15, 1955 | Originally No. 703 from T&NO in January 1953, then became SP's No. 4406 replacement in April of that year. Renumbered again as No. 4473 three months later. |
| 4400 | June 1930 | 61410 | August 23, 1930 | March 23, 1954 | Loaned to T&NO as No. 708 from 1943 to 1952. Returned to the SP as No. 4470 in March 1953 and renumbered again as No. 4400 in July of that year. |
| 4401 | June 1930 | 61411 | August 25, 1930 | June 8, 1955 | Used for evaluation of various burner arrangements and different usage grades of oil in Sacramento, California in September 1946 until late 1951. |
| 4402 | June 1930 | 61412 | August 26, 1930 | April 24, 1959 | Rebuilt in February 1932, after being involved in a boiler explosion at Richvale, California on December 25, 1931. |
| 4403 | June 1930 | 61413 | August 27, 1930 | August 15, 1955 | Loaned to T&NO as No. 709 in 1943. Returned to the SP as No. 4471 in 1952 and renumbered again in July 1953 as No. 4403. |
| 4404 | June 1930 | 61414 | August 27, 1930 | ? | Sold to T&NO as No. 710 in 1943. |
| 4405 | June 1930 | 61415 | August 28, 1930 | May 27, 1957 | Vacuum brakes added in February 1957. |
| 4406 | July 1930 | 61430 | September 18, 1930 | ? | Sold to T&NO as No. 704 in March 1941. |
| 4407 | July 1930 | 61431 | September 22, 1930 | June 1, 1955 | Loaned to T&NO as No. 705 from 1941 to 1952. Returned to the SP on April 20, 1953. |
| 4408 | July 1930 | 61432 | September 24, 1930 | August 15, 1955 | Loaned to T&NO as No. 706 from 1941 to 1953. Returned to the SP on April 20, 1953. Used as an official portrait of this locomotive class. |
| 4409 | July 1930 | 61433 | October 9, 1930 | September 6, 1955 | Loaned to T&NO as No. 707 from 1941 to 1952. Returned to the SP on June 11, 1953. |