February 19, 1890: The line between Mikumo Station and Tsuge Station (12 miles 63 chains ≒ 20.58 km) was extended and opened, thus completing the entire Kusatsu Line.
1890年（明治23年）2月19日-三雲～柘植間（12M63C≒20.58km）が延伸開業し全線開通。