The whole line will lie within the city of Kawasaki in Kanagawa Prefecture, Japan.
It would link the eastern and western parts of southern Kawasaki that are otherwise not well served by rail transport.
The project is commonly known as the Kawasaki Municipal Subway (川崎市営地下鉄, Kawasaeki shiei chikatetsu).
In 1985, the ministry changed the plan to use the existing Musashino South Line right-of-way, converting it from a freight-only to passenger-only operations.
However, in 2003, due to the weak Japanese economy, the city government postponed the subway's construction for five years.