Agatsuma Line
Services on the section between Naganohara and Ōshi were suspended as of 1 November 1970, and on 7 March 1971, a new line was opened beyond Naganohara to , with the entire line renamed Agatsuma Line at the same time. The Naganohara-Kusatsuguchi to Ōshi line was formally closed as of 1 May 1971. CTC signalling on the entire line was also commissioned at the same time.