| USRA Heavy Pacific | |
| Powertype: | Steam |
| Whytetype: | 4-6-2 |
| Uicclass: | 2′C1′ h2 |
| Driverdiameter: | 790NaN0 |
| Axleload: | 60000lb |
| Weightondrivers: | 180000lb |
| Locoweight: | 300000lb |
| Tenderweight: | 144000lb |
| Locotenderweight: | 444000lb |
| Fuelcap: | Coal |
| Watercap: | 8000usgal |
| Tendercap: | 32000lb |
| Boilerpressure: | 2002NaN2 |
| Firearea: | 70.8square feet |
| Tubearea: | 2407square feet |
| Fluearea: | 1090square feet |
| Fireboxarea: | 284square feet |
| Totalsurface: | 3808square feet |
| Superheaterarea: | 882square feet |
| Cylindercount: | Two, outside |
| Cylindersize: | 27x |
| Valvegear: | Baker |
| Valvetype: | 140NaN0 piston valves |
| Tractiveeffort: | 438002NaN2 |
| Factorofadhesion: | 4.1 |
The USRA Heavy Pacific was a USRA standard class of steam locomotive designed under the control of the United States Railroad Administration, the nationalized railroad system in the United States during World War I. This was the standard heavy passenger locomotive of the USRA types, and was 4-6-2 wheel arrangement in the Whyte notation, or 2′C1′ in UIC classification.
A total of 20 locomotives were built under USRA control, with the production split between the Baldwin Locomotive Works and the American Locomotive Company's Richmond plant; these were sent to the following railroads:
| Erie Railroad (ERIE) | 1919 | Ten K-5-As were also built as copies (Nos. 2935-2944) in 1923 and a K-5-B (No. 2960) in 1926 by Baldwin.[2] | 1950-1952 |
Other post-USRA derivatives include the Baltimore and Ohio P-7 and the Southern Railway Ps-4 classes, the former having larger 80 inch drivers, higher tractive effort, and increased boiler pressure, and the latter with smaller 73 inch drivers, larger cabs, feedwater heaters, and later batches given larger tenders.[3]
| Baltimore & Ohio (B&O) | 1927 | Built by Baldwin.[4] | 1958 | ||||
| Southern Railway (SOU) | 1923-1928 |
| 1949-1953 | ||||
| West Point Route (WPR) | 1926 | Nos. 190 and 290 were both built for the Western Railway of Alabama (WRA) and the Atlanta and West Point Railroad (A&WP), respectively.[7] | 1954 | ||||
| Total | 88 |
|---|
Three copies have been preserved.
| No. | Builder | Date built | Post-USRA owner | Location | Image | Disposition |
|---|---|---|---|---|---|---|
| 290 | Lima Locomotive Works | March 1926 | Atlanta and West Point Railroad | Southeastern Railway Museum | In storage, awaiting cosmetic restoration | |
| 1401 | American Locomotive Works | July 1926 | Southern Railway | National Museum of American History | On static display | |
| 5300 | Baldwin Locomotive Works | February 1927 | Baltimore and Ohio Railroad | B&O Railroad Museum | Undergoing cosmetic restoration | |