The Shinkani to Hiromi section was opened in 1920 by the Tobi Railway as a 762 mm (2 ft 6 in) gauge light railway. In 1928, the line was converted to 1,067 mm (3 ft 6 in) gauge, electrified at 600 V DC, and extended to Inuyama. The company merged with Meitetsu in 1943. The voltage was raised to 1,500 V DC in 1965, and the Inuyama to Shinkani section was double-tracked between 1967 and 1970. Freight services ceased in 1982.
Akechi Station: The Tobi Railway opened a 7 km (4.3 mi) line to Yaotsu, electrified at 600 V DC, in 1930. The company merged with Meitetsu in 1943. Between 1952 and 1954, the line was extended to Nishikori to supply construction materials for the Maruyama Dam and hydro-electric power station. The voltage was increased to 1,500 V DC in 1965, but the overhead catenary was decommissioned in 1984. DMUs were then operated on the line until it closed in 2001.