The Class EF66 (EF66形) is a six-axle, three-bogied (Bo′Bo′Bo′) DC electric locomotive designed for fast freight used by Japanese National Railways (JNR) and later operated by its descendants JR West and JR Freight. As of 1 April 2016, 39 locomotives remained in service, all operated by JR Freight.

Kisha Seizo Co., Ltd. was a Japanese manufacturer of railway rolling stock that existed from 1896 to 1972.1896: Established by Masaru Inoue as the Kisha Seizo Joint Stock Company . 1899: Factory opened in Osaka. 1901: Merged with the Hiraoka Factory , 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. 1972: Merged with Kawasaki Heavy Industries.