 When the line names were officially designated in October 1909, the former became a part of the Kagoshima Main Line and the latter the Hitoyoshi Main Line.In November 1910, with the Hitoyoshi - Yoshimatsu section (which included the Okoba switchback and spiral) opening, both sections were connected and the Hitoyoshi Main Line was merged to the Kagoshima Main Line.In 1927, following the opening of the current 'west coast' Kagoshima Main Line via Sendai, the line was renamed the Hitatsu Line.