Isumi Railway Co., Ltd. is a railway company in Chiba Prefecture, Japan that operates the Isumi Line. The line runs through the Bōsō Peninsula, connecting Ōhara Station to Kazusa-Nakano Station. Known for its scenic rural route, the company uses a variety of diesel railcars, including the Isumi Class 200, 300, and 350 series, as well as some former JR East and West models. With a focus on local connections and community partnerships, Isumi Railway offers a unique travel experience in the picturesque countryside of Chiba.