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Union Pacific class MK-1
2111 in the snow in Idaho in the 1930s
Type and origin Power type Steam Builder Baldwin Locomotive Works (BLW) Build date 1910-1911 Total produced 86
Specifications Configuration: ​  • Whyte 2-8-2 Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Valve gear Walschaerts
Career Class UP: MK-1 Numbers 1900-1929, 2000-2014, 2100-2140 Preserved No. 2005 Disposition One preserved, remainder scrapped

The Union Pacific class MK-1 was a class of 2-8-2 'Mikado' type steam locomotives that were built by the Baldwin Locomotive Works originally for the Oregon Railroad and Navigation Company (OR&N), Oregon Short Line Railroad (OSL) and Union Pacific Railroad (UP) in 1910 and 1911.

History

In 1910, the Oregon-Washington Railroad and Navigation Company (OWR&N) purchased a 2-8-2 'Mikado' locomotive from the Baldwin Locomotive Works and had this single locomotive numbered 440, this locomotive would be renumbered as 500 in 1911, and renumbered to 2100 in 1915.

In 1911, the OWR&N would order another 40 of these locomotives from Baldwin where they were originally numbered as 501–540, but renumbered as 2101–2140. The Oregon Short Line Railroad (OSL) would order 15 locomotives from Baldwin and numbered them as 1100–1114, but renumbering them to 2000–2014 in 1915. The Union Pacific Railroad (UP) would order 30 locomotives from Baldwin where they numbered them as 500–529, renumbering them to 1900–1929 in 1915

OSL No. 2000 was sold to the Spokane International Railroad (SI) in 1936.

Preservation

Only one member of the class is in preservation, No. 2005, which is on static display at Ross Park based in Pocatello, Idaho.

Fleet numbers

References

1. McCullough, Gordon. "UPRR Steam Locomotive Roster by Class and Number" (PDF). Union Pacific Historical Society. Retrieved 2024-09-22.
2. ^ Jones (2019), p. 76

• Jones, Dale W. (2019). Spokane International Railway. Arcadia Publishing. ISBN 978-1-4671-0299-5.

Further reading

• "Simple 2-8-2 for the Oregon Railroad Navigation Co". Railroad and Locomotive Engineering. Vol. 23, no. 10. October 1910. pp. 417–418.
• "Powerful Lignite Burner of the Mikado Type". American Engineer and Railroad Journal. October 1910. pp. 404–406.

• Union Pacific Railroad locomotives
• Oregon Railroad and Navigation Company
• Baldwin locomotives
• 2-8-2 locomotives
• Steam locomotives of the United States
• Railway locomotives introduced in 1910