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Union Pacific Steam Locomotives

This page was last updated on April 11, 2015.

2-8-2 Mikados

The following comes from Thomas R. Lee's introduction for "Union Pacific Prototype Locomotive Photos", Volumes 28-33, 2-8-2s.

The first Mikado (2-8-2) wheel arrangement came to the ORR&N in July of 1910. The first locomotives of this wheel arrangement were built for the Japanese Government Railways by Baldwin in 1897, from which the type derives its name. The Union Pacific changed the name from Mikado and adopted the name MacArthur (the commanding General in the Pacific during World War II), because of our conflict with Japan. Attempts to change the name by other railroads were made with only a little success. The UP and affiliated lines purchased hundreds of Mikado-type locomotives between 1911 and 1921. The early locomotives were provided with the Harriman Common Standard 57-inch drivers. All later versions had 63-inch drivers and were suitable for both freight and passenger service. Locomotives of this class remained supreme until the arrival of heavier power (2-10-2s and 2-8-8-0s) starting in 1917. Into the 1940-era many worked on main line runs where moderate gradients existed. Many were used in yards where heavy switching service was a requirement, and continued to work regularly on main line local freight assignments (and some branch lines where heavier rail and traffic volumes existed) until replaced by diesel locomotives in the mid-1950s.

This class survived the Great Depression, and none of them were scrapped until after World War II due to an acute motive power shortage at that time. A drop in business after the war, along with the purchase of additional diesels assigned to the western lines, allowed the UP to retire 87 MacArthur's in 1946 and 1947. An additional 49 were scrapped in 1948 and 1949. In subsequent years, one by one, the total number of steam locomotives on the roster continued to decline as more diesels were purchased. The last 2-8-2 to be scrapped was UP number 2272 at Cheyenne on July 30, 1958. Four of them survived and have been preserved and donated for display in various communities (the 2564 was later relocated to the Orange Empire Railway Museum at Perris, CA.) along the UP.

Light 2-8-2s (151 locomotives)

Final
Road
Number
Quantity Class Builder Year
Built
Service
Years
Remarks
UP 1900-1929 30 MK-1 Baldwin 1911 1915-1957 Built as UP 500-529, renumbered in 1915
UP 1930-1949 20 MK-2 Baldwin 1912 1915-1958 Built as UP 530-549, renumbered in 1915
OSL 2000-2014 15 MK-1 Baldwin 1911 1915-1958 Built as OSL 1100-1114, renumbered in 1915
OSL 2015-2034 20 MK-2 Baldwin 1912 1915-1956 Built as OSL 1115-1134, renumbered in 1915
OWRR&N 2100 1 MK-1 Baldwin 1910 1915-1955 Built as ORR&N 440, renumbered in 1915
OWRR&N 2101-2140 40 MK-1 Baldwin 1911 1915-1957 Built as OWRR&N 501-540, renumbered in 1915
OWRR&N 2141-2165 25 MK-2 Baldwin 1912-1913 1915-1958 Built as OWRR&N 541-565, renumbered in 1915
Total 151          

Heavy 2-8-2s (196 locomotives)

Final
Road
Number
Quantity Class Builder Year
Built
Service
Years
Remarks
OWRR&N 2166-2171 6 MK-8 Baldwin 1918 1918-1957  
UP 2200-2209 10 MK-3 Baldwin 1911 1915-1957 Built as UP 700-709, renumbered in 1915
UP 2210-2219 10 MK-4 Brooks 1912 1915-1956 Built as UP 710-719, renumbered in 1915
UP 2220-2244 25 MK-5 Baldwin 1913 1915-1958 Built as UP 720-744, renumbered in 1915
UP 2245-2259 15 MK-6 Lima 1914 1915-1957 Built as UP 745-759, renumbered in 1915
UP 2260-2279 20 MK-7 Baldwin 1917 1917-1958  
UP 2280-2294 15 MK-8 Baldwin 1918 1918-1956  
UP 2295-2310 16 MK-9 Brooks 1920 1920-1959  
UP 2311-2320 10 MK-8 Baldwin 1918 1923-1956 Built as OSL 2500 series,
to UP 2300 series in 1923
OSL 2500-2514 15 MK-8 Baldwin 1913 1915-1956 Built as OSL 1200-1214, renumbered in 1915
OSL 2515-2518 4 MK-4 Brooks 1912 1923-1956 Built as UP 2200 series, to OSL in 1923
OSL 2519-2524 6 MK-5 Baldwin 1913 1923-1958 Built as UP 2200 series, to OSL in 1923
OSL 2525-2527 3 MK-6 Lima 1914 1923-1954 Built as UP 2200 series, to OSL in 1923
OSL 2528-2532 5 MK-7 Baldwin 1917 1923-1956 Built as UP 2200 series, to OSL in 1923
OSL 2555-2564 10 MK-10 Brooks 1921 1923-1959 Built as LA&SL 3716-3725, to OSL in 1923
LA&SL 2700-2708 9 MK-6 Schenectady 1914 1920-1956 Built as LA&SL 3700-3708, renumbered in 1920
LA&SL 2709-2715 7 MK-7 Lima 1917 1920-1957 Built as OSL 2500 series,
to LA&SL 3700 series in 1918,
to LA&SL 2700 series in 1920
LA&SL 2726-2732 7 MK-5 Baldwin 1913 1923-1957 Built as OSL 1200 series,
to OSL 2500 series in 1915, to LA&SL in 1923
LA&SL 2733-2735 3 MK-7 Lima 1917 1923-1958 Built as OSL 2500 series, to LA&SL in 1923
Total 196          

USRA 2-8-2s (39 locomotives)

Final
Road
Number
Quantity Class Builder Year
Built
Service
Years
Remarks
UP 2480-2499 20 MK-Special Schenectady 1918 1920-1958 Built as UP 2295-2314, renumbered in 1920
OSL 2535-2554 19 MK-Special Schenectady 1918-1919 1918-1959  
Total 39          

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