Kururi Line
The private Kihara Line from Ōhara Station was extended to Kazusa-Nakano Station in 1934, and it was planned that the Kururi Line and the Kihara Line would be connected to form a single route across the Bōsō Peninsula (which would have been named the Kihara Line). However, due to World War II, the plan was abandoned, and Kururi Line was never to be extended into the most mountainous area of the peninsula. Services on the section from Kururi Station to Kazusa-Kameyama Station were suspended from 1944 to 1947.