Narrow gauge (36”) Mikado type (2-6-0) locomotive Colorado & Southern #9 was built by the Cooke Locomotive Works in Paterson, New Jersey in 1884 for the Denver, South Park & Pacific Railroad as #72. The following year, it was renumbered #114. Four years later, the DSP&P was sold to the Denver, Leadville & Gunnison Railway, which was consolidated into the Colorado & Southern in 1899 when #114 was renumbered as Class B-3-A #9. Within a few years, #9 was re-boilered with a wagon top boiler and, in the late 1910s, it received a new frame.
#9 weighs 74,000 lbs, 64,000 lbs on its 40” drivers and has a driver wheelbase of 10’ and engine wheelbase of 16’. With internal Stephenson valve gear, 15” x 18” cylinders, a 147 sq ft grate, 100.2 sq ft firebox and total heating surface of 941 sq ft, it operated at a boiler pressure of 190 psi delivering 16,352 lbs tractive effort. The tender weighs 49,250 lbs light and has a capacity of 6 tons of coal and 1,600 gallons of water.
#9 was primarily used in passenger service, and it hauled the last passenger train from Leadville to Denver on 10th April 1937.