1901: Merged with the Hiraoka Factory (平岡工場, Hiraoka Kōjō), a coach and car maker in Tokyo. The two plants were reorganized as the Osaka Head Office and the Tokyo Branch.
1912: Becomes Kisha Seizo Co., Ltd. (汽車製造株式会社) after corporate restructuring.
1936: Head office moved to Tokyo; Osaka Head Office becomes Osaka Branch.
1944: The two branches (factories) renamed Osaka Works and Tokyo Works respectively.
1968: Construction of railway wagon factory in Utsunomiya.