JR East has announced consultations are to be held concerning the potential replacement of the last section from Kururi to Kazusa-Kamegama (around 10 km (6.2 mi)) with a bus service due to a ~75% decline in patronage since 1987.

The Chiba Prefectural Government opened the 762 mm (2 ft 6 in) gauge section from Kisarazu to Kururi as a light railway on 28 December 1912.

In 1922, the Railway Construction Act was amended by the Diet, and a new rail line connecting Kisarazu Station to Ōhara Station on the Sotobō Line via Kururi and Ōtaki, to transect the Bōsō Peninsula, appeared on the list as compensation for the underdeveloped network of roads in the area at that time.

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.

[2] The Kururi Line suffers from a small number of passengers and operates at deficit that requires JR East to give it subsidies.