The is a subway line in Tokyo, Japan, owned and operated by Tokyo Metro. Overview 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 – nearly six times the length of the Hanzōmon Line alone. The Hanzōmon Line has direct interchanges with all other Tokyo Metro and Toei lines. It connects with the Tokyo Metro Ginza Line at five stations (the four stations between Shibuya and Nagatachō, as well as at Mitsukoshimae Station. The line is named after the west gate of the Imperial Palace (Hanzōmon), which in turn is named after 16th century samurai Hattori Hanzō, who was important to the founding of the shogunate which built the palace. The Hanzōmon Line's color on maps and station guides is purple, and stations carry the prefix "Z" followed by a number. According to the Tokyo Metropolitan Bureau of Transportation, as of June 2009 the Hanzōmon Line is the sixth most crowded subway line in Tokyo, at its peak running at 173% capacity between Shibuya and Omotesandō stations. Station list All stations are located in Tokyo. All services stop at every station. Rolling stock Current Tokyo Metro 18000 series Tokyo Metro 08 series Tokyo Metro 8000 series Tokyu 2020 series Tokyu 5000 series Tobu 50000 series Tobu 50050 series Former Tobu 30000 series Tokyu 2000 series Tokyu 8500 series Tokyu 8590 series History The Hanzōmon Line was first planned in 1971, along with the Chiyoda Line and Yūrakuchō Line, as a reliever line for the heavily congested Ginza Line. Its initial routing was from Futako-Tamagawa Station on the Tōkyū Den-en-toshi Line to a new station in the Fukagawa district of Kōtō. In 1985, a second draft plan from the Ministry of Transportation moved the Hanzōmon Line's final terminus to Matsudo. During the planning stage,