Tōkyū Den-en-toshi Line
The 16.8 km line serves the wards of Shibuya, Minato, Chiyoda, Chūō, Kōtō, and Sumida. Despite being shorter in length than nearly all other Tokyo subway lines, the Hanzōmon Line operates some of the longest through services with private railways – namely Tōkyū Corporation and Tobu Railway. The line is connected to Tōkyū Den-en-toshi Line at Shibuya Station to the south, and to the Tobu Skytree Line at to the north. Through trains operate between on the Tōkyū Den-en-toshi Line and on the Tobu Skytree Line, onward to on the Tobu Isesaki Line and on the Tobu Nikko Line. Through-service trains between Chūō-Rinkan and Minami-Kurihashi cover a total distance of 98.5 km in a single run – more than five times the length of the Hanzōmon Line alone.