The Izuhakone Railway Sunzu Line is a commuter railway line of the Izuhakone Railway, a private railroad in Japan. The line connects Mishima Station in the city of Mishima with Shuzenji Station in the city of Izu, both within Shizuoka Prefecture. The name "Sunzu" comes from the former provinces of Suruga and Izu, although the line at present operates only within the borders of former Izu Province.

The Tōkaidō Shinkansen is a Japanese high-speed rail line that is part of the nationwide Shinkansen network. Along with the Sanyo Shinkansen, it forms a continuous high-speed railway through the Taiheiyō Belt, also known as the Tokaido corridor. Opening in 1964, running between Tokyo and Shin-Ōsaka, it is the world's first high-speed rail line, and it remains one of the world's busiest. Since 1987, it has been operated by the Central Japan Railway Company, prior to that by Japanese National Railways (JNR).