| Southern Pacific Class P-8 | |
| Powertype: | Steam |
| Builder: | Baldwin Locomotive Works |
| Builddate: | 1921 |
| Totalproduction: | 15 |
| Whytetype: | 4-6-2 |
| Uicclass: | 2'C1' |
| Driverdiameter: | 73inches |
| Wheelbase: | 75.8feet |
| Engine Total: | 35.5feet |
| Drivers: | 13feet |
| Axleload: | 60700lbs |
| Weightondrivers: | 180000lb |
| Locoweight: | 297800lb |
| Tenderweight: | 160800lbs |
| Locotenderweight: | 457800lbs |
| Fueltype: | Oil |
| Fuelcap: | 4000usgal |
| Watercap: | 12000usgal |
| Firearea: | 70.4square feet |
| Boilerpressure: | 210psi |
| Fireboxarea: | 283square feet |
| Cylindersize: | 25x |
| Valvegear: | Walschaerts |
| Tractiveeffort: | 468002NaN2 |
| Factorofadhesion: | 4.15 |
| Operator: | Southern Pacific Transportation Company |
| Operatorclass: | P-8 |
| Fleetnumbers: | 2461-2475 |
| Preservedunits: | Nos. 2467 and 2472 |
| Disposition: | Two preserved, remainder scrapped |
The Southern Pacific Class P-8 was a class of 4-6-2 "Pacific" type steam locomotives that were built by the Baldwin Locomotive Works for the Southern Pacific Transportation Company in 1921.
In all, a total of 15 locomotives of what had become the Southern Pacific Class P-8 were ever constructed by the Baldwin Locomotive Works in 1921 and they were all numbered as 2461-2475. They were designed to be used on the Southern Pacific specifically for the Overland Route from Ogden, Utah, to Oakland, California.
The P-8 locomotives had thrived until the larger, more powerful Mt-class of 4-8-2s were delivered in the late 1920s. Most of the P-8s were then transferred further west for service between Oakland, California and Sacramento, California, along with the demanding Peninsula Commute services between San Francisco, California and San Jose, California.
Withdrawal of the class commenced in 1958, and all but two were scrapped.
Two locomotives have survived into preservation.
See main article: Southern Pacific 2467 and Southern Pacific 2472.