| USRA Light Mountain | |
| Powertype: | Steam |
| Whytetype: | 4-8-2 |
| Uicclass: | 2′D1′ h2 |
| Builddate: | 1918-1930 |
| Totalproduction: | 47 (90 plus copies) |
| Driverdiameter: | 690NaN0 |
| Axleload: | 55000-2NaN-2 |
| Weightondrivers: | 220000-2NaN-2 |
| Locoweight: | 320000-2NaN-2 |
| Tenderweight: | 172000-2NaN-2 |
| Locotenderweight: | 492000-2NaN-2 |
| Fueltype: | Coal |
| Fuelcap: | 32000-2NaN-2 |
| Watercap: | 10000usgal |
| Boilerpressure: | 200sigfig=3NaNsigfig=3 |
| Firearea: | 70.8square feet |
| Tubearea: | 2598square feet |
| Fluearea: | 1176square feet |
| Fireboxarea: | 329square feet |
| Totalsurface: | 4130square feet |
| Superheaterarea: | 957square feet |
| Cylindercount: | Two |
| Cylindersize: | 27x |
| Valvegear: | Baker, then Walschaerts |
| Valvetype: | 140NaN0 piston valves |
| Tractiveeffort: | 539002NaN2 |
| Factorofadhesion: | 4.1 |
| Scrapdate: | 1943-1959 |
| Disposition: | All scrapped |
The USRA Light Mountain 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 light freight locomotive of the USRA types, and was of 4-8-2 wheel arrangement in the Whyte notation, or 2′D1′ in UIC classification.
A total of 47 locomotives were built under the auspices of the USRA.
| Railroad | Quantity | Class | Road numbers | Notes | ||
|---|---|---|---|---|---|---|
| align=left | 7 | MT-69 | 5301–5307 | align=left | Built 1919 by ALCO. All scrapped, 1943-1947. | |
| align=left | 5 | J1-54 | 550–554 | align=left | Built 1919 by ALCO-Richmond. All scrapped, 1945-1949. | |
| align=left | 10 | R-1 | 3300–3309 | align=left | Built 1919 by ALCO-Schenectady. All scrapped, 1949-1951. | |
| align=left | 25 | Ts-1 | 1475–1499 | align=left | Built 1919 by ALCO. Three to AGS 6692–6694, five to CNOTP 6495–6499. All scrapped, 1950-1955. | |
| Total | 47 |
| Railroad | Quantity | Class | Road numbers | Notes | |||
|---|---|---|---|---|---|---|---|
| align=left | Louisville and Nashville Railroad | 22 | L-1 | 400–421 | align=left | Built 1926-1930 by Baldwin . All Scrapped 1953-1957 | |
| align=left | 8 | J1-54 | 555–562 | align=left | Built 1922 by Baldwin. All scrapped, 1955-1956. | ||
| align=left | 30 | R-1-a | 3310–3339 | align=left | Built 1919 by ALCO. All scrapped, 1943-1958. | ||
| align=left | 9 | R-1-b | 3304–3348 | align=left | Built 1918-1919 by ALCO. All scrapped, 1943-1945. | ||
| align=left | align=left | ||||||
| align=left | Minneapolis, St. Paul and Sault Ste. Marie Railroad (Soo Line) | 21 | N-20 | 4000–4020 | align=left | Built 1926-1930 by ALCO and Soo Line. All scrapped, 1944-1959. | |
| Total | 90 |