The Riwà Ân Line is a partially electrified standard-gauge secondary line of the Korean State Railway in South Hamgyà Âng Province, North Korea, running from Riwà Ân Ch'à Âlsan to Ch'aho, via the Rahà ÂngâÂÂChà Ângsan section of the P'yà Ângra Line.
On 20 September 1929, the Chosen Government Railway (Sentetsu) opened three new lines: the Pukch'à Âng Line, the Ch'à Âlsan Line from Rahà Âng on the Hamgyà Âng Line to Riwà Ân Ch'à Âlsan (not to be confused with the present-day Ch'à Âlsan Line that connects to the P'yà Ângà Âi Line), and the Ch'aho Line from Chà Ângsan on the Hamgyà Âng Line to Ch'aho.
After the Korean State railway merged the Hamgyà Âng Line, the Ch'à Ângra Line, and the northern section of the former Kyà Ângwà Ân Line to create the P'yà Ângra Line, it combined the Ch'aho and Ch'à Âlsan lines to create the current Riwà Ân Line, with the newly formed line sharing the Rahà ÂngâÂÂChà Ângsan section with the P'yà Ângra Line.
A yellow background in the "Distance" box indicates that section of the line is not electrified.