Takadanobaba was the western terminus of the Tozai Line until the connection to Nakano Station and the Chuo Main Line opened in March 1966.
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The Kihara Line from Ōhara Station on the Sotobō Line was extended to Kazusa-Nakano Station, and it was planned that Kururi Line and Kihara Line would be connected to form a single route across the Bōsō Peninsula (which would have been named the Kihara Line).
Mujinazuka Station ( between Narushima Station and Hon-Nakano Station ), as well as Kobugannon Station, was closed on December 25, 1941 after Koizumi Line was purchased by Tobu Railway Company in 1937.