Following the post-war launch of the Hankyu (Electric) Railway Series 550 in 1948, Hankyu's rolling stock was manufactured by Naniwa-Koki (later, Alna Sharyo (rolling stock) Co., Ltd.), an affiliate of Hankyu (in Hankyu Railway, the word Japanese word for 'build' is used to refer to the manufacturing of a new series of rolling stock).
戦後1948年の阪急550形電車以後、すべての阪急車両は系列のナニワ工機（後のアルナ車両）が建造していた（阪急では車両を新規製造することを「建造」と表現する）。