碓氷峠
When the Japanese National Railways (JNR) were divided and privatized on April 1, 1987, Shinetsu Main Line became a part of the system of East Japan Railway Company (JR East). On October 1, 1997, JR East opened the Nagano Shinkansen with a stop at Karuizawa. At the same time, JR East ceased to operate the conventional Shinetsu Main Line between Yokokawa and , of which, the section between Yokokawa and Karuizawa (Usui Pass) was closed permanently and the remaining section was transferred to Shinano Railway. Since then, Karuizawa Station has been shared by JR East and Shinano Railway.