| Great Northern P-1 class | |
| Powertype: | Steam |
| Builder: | Lima Locomotive Works |
| Serialnumber: | 1364-1378 |
| Builddate: | May-June 1914 |
| Totalproduction: | 15 |
| Rebuilddate: | June-November 1928 |
| Numberrebuilt: | 15 |
| Whytetype: | 4-8-2 |
| Uicclass: | 2′D2′ h1 |
| Leadingdiameter: | 36.50NaN0 |
| Driverdiameter: | 630NaN0 |
| Trailingdiameter: | 42.50NaN0 |
| Wheelbase: | 71.330NaN0 |
| Axleload: | 55000abbr=inNaNabbr=in |
| Weightondrivers: | 218000abbr=inNaNabbr=in |
| Locoweight: | 236000abbr=inNaNabbr=in |
| Tenderweight: | 161000abbr=inNaNabbr=in |
| Locotenderweight: | 487000abbr=inNaNabbr=in |
| Fueltype: | Nos. 1750-1759: Coal Nos. 1760-1764: Fuel oil |
| Fuelcap: | 151NaN1 |
| Watercap: | 8000usgal |
| Firearea: | 78square feet |
| Boiler: | 950NaN0 |
| Boilerpressure: | 1802NaN2 |
| Fireboxarea: | 340square feet |
| Cylindercount: | Two |
| Cylindersize: | 28x |
| Valvegear: | Walschaert |
| Tractiveeffort: | 609282NaN2 |
| Factorofadhesion: | 3.58 |
| Operator: | Great Northern |
| Operatorclass: | P-1 |
| Fleetnumbers: | 1750–1764 (P-1) 2175-2189 (Q-2) |
| Retiredate: | 1928 (1953-1958 as Q-2s) |
| Preservedunits: | 0 |
| Disposition: | All rebuilt to Q-2 Class 2-10-2s in 1928 and scrapped by last retirement |
The Great Northern P-1 was a class of 15 4-8-2 "Mountain" type steam locomotives built by the Lima Locomotive Works in 1914 and operated by the Great Northern Railway.
The P-1s were at first assigned to pull passenger trains, but were proven to be too slow and were reassigned to freight service. Between June and November 1928, they were all rebuilt by the GN's Superior, Great Falls, and Hillyard Shops to Q-2 Class 2-10-2s.[1]
Neither the P-1s nor the Q-2s have survived into preservation today. Retirement started on July 16, 1953 and were all retired by April 1958.