The Tosa Kuroshio Railway (土佐くろしお鉄道 Tosa Kuroshio Tetsudō) is a railway company in Kōchi Prefecture, Japan. The name comes from the province of Tosa and Kuroshio Current. The third sector company (in Japanese sense), founded in 1986, took a former Japanese National Railways (JNR) line, Nakamura Line, and later two JNR planned lines those constructions were halted halfway through, Sukumo and Asa lines. This is one of the few Japanese railway operator that provide its official website in Japanese, English, and French.
Like Shikoku Railway Company (JR Shikoku), its stations are numbered with alphabets preceding. Nahari Station of Asa Line, for instance, is numbered GN21, and the next station, Tano, is GN22.
- Nakamura Line (中村線): Labeled TK
- Kubokawa — Nakamura: 43.0 km
- Sukumo Line (宿毛線): Labeled TK
- Sukumo — Nakamura: 23.6 km
- Asa Line (阿佐線): Labeled GN
- The official nickname is Gomen-Nahari Line (ごめん・なはり線).
- Gomen — Nahari: 42.7 km