The Kiso Forest Railway No. 9 is a Baldwin 0-4-2RT 6-10 1/3 C91 steam locomotive built in June 1929 in Pennsylvania. It is one of ten locomotives in the last of three total orders built for the Imperial Forestry Bureau of Japan, for use on the Kiso Forest Railway, a 30-inch gauge logging railroad in the Nagano Prefecture in the center of Japan- west of Tokyo and north of Nagoya.
