The is a 16.1 km railway line owned by the third-sector company Heisei Chikuhà  Railway. The line runs north from Tagawa to Nà Âgata, all within Fukuoka Prefecture.
The line was first built by the Chikuhà  Kà Âgyà  Railway, later renamed , as a branch line of the Chikuhà  Main Line. Used to transport coal from the Chikuhà  coal mine, the line had two stations: Nà Âgata Station and Kanada Station. The entire Chikuhà  Railway system was merged in 1897 with Kyushu Railway, where the line was extended to Ita Station (now Tagawa-Ita Station) in 1899. Kyushu Railway was nationalized in 1907 and was merged into Japanese Government Railway.
Even though the Ita Line was widened to a double-track railway in 1911, ridership suffered with the decline of the Chikuhà  coal mine. Therefore, JR Kyushu, the successor of Japanese Government Railway, privatized and transferred the Ita Line, Itoda Line, and Tagawa Line to the newly founded Heisei Chikuhà  Railway.
Even after privatization, the Japan Freight Railway Company still ran trains from Kanada north to Mojiko Station in Kitakyushu, transporting cement from a Mitsui Tankà  plant near Kanada Station. This service ceased with the plant's closure in March 2004.
The line is not electrified and is double-tracked for the entire line. Some services continue past Kanada Station on the Itoda Line to Tagawa-Gotà Âji Station.
All stations are within Fukuoka Prefecture.