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.
Original owners USRA originals Railroad Quantity Class Roadnumbers Notes Missouri Pacific Railroad 7 MT-69 5301–5307 Built 1919 by ALCO. All scrapped, 1943-1947. Nashville, Chattanooga and St. Louis Railway 5 J1-54 550–554 Built 1919 by ALCO-Richmond. All scrapped, 1945-1949. New York, New Haven and Hartford Railroad 10 R-1 3300–3309 Built 1919 by ALCO-Schenectady. All scrapped, 1949-1951. Southern Railway 25 Ts-1 1475–1499 Built 1919 by ALCO. Three to AGS 6692–6694,five to CNOTP 6495–6499. All scrapped, 1950-1955. Total 47
Copies Railroad Quantity Class Roadnumbers Notes Louisville and Nashville Railroad 22 L-1 400–421 Built 1926-1930 by Baldwin . All Scrapped 1953-1957 Nashville, Chattanooga and St. Louis Railway 8 J1-54 555–562 Built 1922 by Baldwin. All scrapped, 1955-1956. New York, New Haven and Hartford Railroad 30 R-1-a 3310–3339 Built 1919 by ALCO. All scrapped, 1943-1958. New York, New Haven and Hartford Railroad 9 R-1-b 3304–3348 Built 1918-1919 by ALCO. All scrapped, 1943-1945. New York, Ontario and Western Railway Minneapolis, St. Paul and Sault Ste. Marie Railroad (Soo Line) 21 N-20 4000–4020 Built 1926-1930 by ALCO and Soo Line. All scrapped, 1944-1959. Total 90 None of the originals built by the USRA or any of the subsequent copies were preserved, being scrapped from 1943 to 1959.
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