The Hocking Valley Railway came under the control of the C&O in 1910 and when it became necessary to buy new locomotives, the C&O designs were modified for use to build HV locomotives.

In 1912, the HV ordered five "Mikado", 2-8-2 locomotives from the Richmond Works of ALCO. These locomotives arrived in 1912 and were designated as Class M-1 and given road numbers 180-184. The following year six more Class M-1 "Mikados" were delivered from ALCO's Richmond Works and were assigned road numbers 185-190. These locomotives were very similar to the C&O Class K-1 "Mikados" except they were 4" shorter, 7500 pounds heavier, had a different bell, sandbox and headlight. The M-1s had a 185 psi boiler pressure, 15 pounds more than the K-1s, which increased the tractive effort by 5,300 pounds. The tender carried two more tons of coal then the Class K-1s.

In April 1930, the Hocking Valley was merged with the C&O and the M-1s were reclassified as Class K and assigned C&O road numbers 1089-1099. There are no surviving Hocking Valley 2-8-2 Mikado type locomotives.