Union Pacific Steam Locomotives, 1915-1962

General Notes:

1. UP 1800-1807 were built with Belpaire fireboxes

Notes:

1. UP 1800 was built as UP 1500 in 1899; to UP 1800 in 1915; vacated in 1925
2. UP 1801 was built as UP 1501 in 1899; to UP 1801 in 1915; vacated in 1925
3. UP 1802 was built as UP 1502 in 1899; to UP 1802 in 1915; vacated in 1925
4. UP 1803 was built as UP 1503 in 1899; to UP 1803 in 1915; vacated in 1925
5. UP 1804 was built as UP 1504 in 1899; to UP 1804 in 1915; vacated in 1925
6. UP 1805 was built as UP 1505 in 1899; to UP 1805 in 1915; vacated in 1926
7. UP 1806 was built as UP 1506 in 1899; to UP 1806 in 1915; vacated in 1926
8. UP 1807 was built as UP 1507 in 1899; to UP 1807 in 1915; vacated in 1926

Notes:

1. UP 1817 was built as UPRR 95 in 1868; to UPRy 95 in 1880; to UPRy 921 in 1885; rebuilt to UPRy 1701 in 1892; to UP 1701 in 1898; to UP 1817 in 1915; to UP 1317 in 1915; vacated in 1926

Notes:

1. UP 1818 was built as KP 104 in 1880; to UPRy 1020 in 1885; rebuilt to UPRy 1702 in 1893; to UP 1702 in 1898; to UP 1818 in 1915; to UP 1318 in 1915; vacated in 1926

Notes:

1. UP 1819 was built as UPRR 96 in 1868; to UPRy 96 in 1880; to UPRy 922 in 1885; rebuilt to UPRy 1700 in 1892; to UP 1700 in 1898; to UP 1819 in 1915; to UP 1319 in 1915; vacated in 1928

Notes:

1. OSL 1850 was built as OSL 900 (1st) in 1899; to OSL 930 in 1912; to OSL 1850 in 1915; vacated in 1928
2. OSL 1851 was built as OSL 901 (1st) in 1899; to OSL 931 in 1912; to OSL 1851 in 1915; vacated in 1926
3. OSL 1852 was built as OSL 902 (1st) in 1899; to OSL 932 in 1912; to OSL 1852 in 1915; vacated in 1928
4. OSL 1853 was built as OSL 903 (1st) in 1899; to OSL 933 in 1912; to OSL 1853 in 1915; vacated in 1928
5. OSL 1854 was built as OSL 904 (1st) in 1899; to OSL 934 in 1912; to OSL 1854 in 1915; vacated in 1926
6. OSL 1855 was built as OSL 905 (1st) in 1899; to OSL 935 in 1912; to OSL 1855 in 1915; vacated in 1928
7. OSL 1856 was built as OSL 906 (1st) in 1899; to OSL 936 in 1912; to OSL 1856 in 1915; vacated in 1928

General Notes:

1. Classes MK-1 and MK-2 were classed as Light Mikado; classes MK-3 through MK10 were classed as Heavy Mikado
2. All MK (Mikado) classes were changed to MacA (MacArthur) classes during World War II.
3. UP 1913, 1915, 1917, 1919 and 1928 were equipped with Duplex stokers, increasing their operating weight from 206,200 pounds to 210,000 pounds

Notes:

1. UP 1917 was built as UP 517 in 1911; to UP 1917 in 1915; vacated in 1947; sold to Spokane International 1917
2. UP 1925 was built as UP 525 in 1911; to UP 1925 in 1915; vacated in 1947, scrapped due to damage caused by roundhouse fire at Huntington, Oregon

General Notes:

1. Classes MK-1 and MK-2 were classed as Light Mikado; classes MK-3 through MK10 were classed as Heavy Mikado
2. All MK (Mikado) classes were changed to MacA (MacArthur) classes during World War II.
3. UP 1930, 1932-1937 and 1939-1946 were equipped with Duplex stokers, increasing their operating weight from 206,200 pounds to 210,000 pounds

Notes:

1. UP 1936 was built as UP 536 in 1911; to UP 1936 in 1915; vacated in 1947; sold to Spokane International 1936

General Notes:

1. Classes MK-1 and MK-2 were classed as Light Mikado; classes MK-3 through MK10 were classed as Heavy Mikado
2. All MK (Mikado) classes were changed to MacA (MacArthur) classes during World War II.
3. OSL 2000, 2003, 2005, 2006, 2007, 2012 and 2014 were equipped with Duplex stokers, increasing their operating weight from 208,450 pounds to 210,000 pounds

Notes:

1. OSL 2000 was built as OSL 1100 in 1911; to OSL 2000 in 1915; vacated in 1947; sold to Spokane International 2000
2. OSL 2005 was built as OSL 1105 in 1911; to OSL 2005 in 1915; vacated in 1958; donated to City of Pocatello, Idaho, displayed in Ross Park

General Notes:

1. Classes MK-1 and MK-2 were classed as Light Mikado; classes MK-3 through MK10 were classed as Heavy Mikado
2. All MK (Mikado) classes were changed to MacA (MacArthur) classes during World War II.
3. OSL 2016, 2018, 2019, 2021, 2025, 2030, 2031, 2032, 2033 and 2034 were equipped with Duplex stokers, increasing their operating weight from 208,450 pounds to 210,000 pounds

General Notes:

1. Classes MK-1 and MK-2 were classed as Light Mikado; classes MK-3 through MK10 were classed as Heavy Mikado
2. All MK (Mikado) classes were changed to MacA (MacArthur) classes during World War II.

Notes:

1. OWRR&N 2100 was built as ORR&N 440 in 1910; to OWRR&N 500 in 1911; to OWRR&N 2100 in 1915; vacated in 1955

General Notes:

1. OWRR&N 2101-2120 were ordered as Oregon Railroad & Navigation Company 501-520, but delivered in April 1911 as OWRR&N 501-520 after the OWRR&N consolidation in December 1910.
2. Classes MK-1 and MK-2 were classed as Light Mikado; classes MK-3 through MK10 were classed as Heavy Mikado
3. All MK (Mikado) classes were changed to MacA (MacArthur) classes during World War II.
4. OWRR&N 2103 was equipped with a booster trailing truck, adding about 10,500 pounds to its maximum tractive effort

General Notes:

1. Ordered as O&W 300-319; delivered in March and April 1911 as OWRR&N 521-540
2. OWRR&N 2138 was equipped with tender booster in 1926; removed in 1936-1939; 10,960 pounds additional tractive effort
3. Classes MK-1 and MK-2 were classed as Light Mikado; classes MK-3 through MK10 were classed as Heavy Mikado
4. All MK (Mikado) classes were changed to MacA (MacArthur) classes during World War II.
5. OWRR&N 2138 was equipped with a booster trailing truck, adding about 10,500 pounds to its maximum tractive effort

Notes:

1. OWRR&N 2136 was vacated at Baker, Oregon in May 1947 and sold to Mount Hood Railway no. 36 at Hood River, Oregon.
2. Martin Hansen wrote the followng on November 14, 2021:
3. In 1947, when the Union Pacific delivered this brute of a 2-8-2 locomotive to the Mt. Hood Railroad at their yards in Hood River, Oregon, the shortline was certain they had solved their motive power shortage once and for all. This beast would certainly be able to haul more tonnage up through the switchback on the way to Dee and then on to Parkdale than the current Baldwin 70-ton 2-8-2 that the Mt. Hood RR had in service.
4. Before she was put in service her number was shortened to simply "36" and the UP name was painted over and the Mt. Hood Railroad name put in its place. With this all In place it was time to put her to work. That's when the plan came unraveled.
5. No sooner had the "new" #36 left the yards with her first train when she rolled the rail under her and landed on the ties. This was repaired and she started off again only to repeat the same process all over again. Obviously no one had realized that weight and the long ridged wheel base of the drivers was much more that MtHRR 2-8-2 #1 and clearly more than the light rail of the railroad could handle.
6. In disgust, the railroad officials realized they had purchased an albatross that they would never be able to put in service. #36 was pushed off on to a siding in Hood River to wait out her days before they called for the scrapper. She would be a constant reminder for the railroad that new motive power purchases in the future would have to take into account the limitations of the track used by the railroad.
7. (Read more about the Mount Hood Railway)

General Notes:

1. OWRR&N 2147, 2149, 2151, 2152, 2154 were equipped with tender boosters in 1926; removed in 1936-1939; 10,960 pounds additional tractive effort
2. Classes MK-1 and MK-2 were classed as Light Mikado; classes MK-3 through MK10 were classed as Heavy Mikado
3. All MK (Mikado) classes were changed to MacA (MacArthur) classes during World War II.
4. OWRR&N 2149, 2151, 2152, 2154 were equipped with a booster trailing truck, adding about 10,500 pounds to their maximum tractive effort

General Notes:

1. Classes MK-1 and MK-2 were classed as Light Mikado; classes MK-3 through MK10 were classed as Heavy Mikado
2. All MK (Mikado) classes were changed to MacA (MacArthur) classes during World War II.
3. OWR&N 2165 was equipped with train signals and steam heating for passenger service, adding about 1,000 pounds to its weight-on-drivers, about 5,000 pounds to its total engine weight, and about 9,000 pounds to its total engine and tender weight

General Notes:

1. OWRR&N 2166-2168 were equipped with train signals and steam heating for passenger service
2. OWRR&N 2169, 2170, 2171 were equipped with tender boosters in 1926; removed in 1936-1939; 10,960 pounds additional tractive effort
3. Classes MK-1 and MK-2 were classed as Light Mikado; classes MK-3 through MK10 were classed as Heavy Mikado
4. All MK (Mikado) classes were changed to MacA (MacArthur) classes during World War II.
5. OWR&N 2166-2168 were equipped with train signals and steam heating for passenger service, adding about 1,000 pounds to their weight-on-drivers, about 5,000 pounds to their total engine weight, and about 9,000 pounds to their total engine and tender weight
6. OWRR&N 2169-2171 were equipped with a booster trailing truck, adding about 10,500 pounds to their maximum tractive effort

Notes:

1. OWRR&N 2166 was wrecked on January 2, 1947 at Auburn, Washington