The Tōyō Rapid Railway Line (東葉高速線, Tōyō Kōsoku-sen) is a rapid transit line owned by the third-sector company Tōyō Rapid Railway Co., Ltd., which runs between Nishi-Funabashi Station in Funabashi, Chiba and Tōyō-Katsutadai Station in Yachiyo, Chiba. The name Tōyō (東葉) comes from the characters for Tokyo and Chiba. The line is an extension of the Tokyo Metro Tōzai Line.