Seikan Tunnel
From 15 November 1982, with the opening of the Tōhoku Shinkansen to , the "Hatsukari" service was truncated to operate between Morioka and Aomori. This was extended to operate to in Hokkaido from 13 March 1988, following the opening of the undersea Seikan Tunnel. The maximum speed was raised to through the Seikan Tunnel from 16 March 1991.