Just wanted to share my experience of walking through the crowds in the busiest train station in the world... with a two year old on my shoulders! http://www.japanvisitor.com/japan-city-guides/japan-stations/shinjuku-station Shinjuku Station is located in the south west of central Tokyo in the Shinjuku district of the capital. Shinjuku is the busiest station in Tokyo (and the world) ahead of Ikebukuro Station and Shibuya Station with an estimated 3.6 million people passing through on an average weekday, many of whom are commuters from Tokyo's western suburbs. Shinjuku Station began in 1885 and the first subway connected to it in 1959. In terms of size, Shinjuku Station is the second largest station building in the world after Nagoya Station in Aichi Prefecture, central Japan. 13 train lines (if you count the nearby Seibu Shinjuku Line) serve Shinjuku Station. Japan Rail (JR) Shinjuku Station Five JR lines converge on Shinjuku Station. Shinjuku Station. JR Yamanote Line JR Chuo-Sobu Line JR Saikyo Line JR Shonan-Shinjuku Line JR Narita Express Shinjuku Station Subway Lines There are three Shinjuku subway stations (station code in parentheses): Shinjuku Station (E-27) on the Toei Oedo Subway Line Shinjuku Station (M-08) on the Tokyo Metro Marunouchi Subway Line Shinjuku Station (S-01) on the Tokyo Metro Shinjuku Subway Line Underground passages also link Shinjuku Station to the following six Tokyo subway stations nearby: Nishi-shinjuku Station (M-07) on the Metro Marunouchi Line Shinjuku Nishi-guchi Station (E-01) on the Toei Oedo Line Tocho-mae Station (E-28) on the Toei Oedo Line Shinjuku San-chome Station (M-09) on the Metro Marunouchi Line, (S-02) on the Toei Shinjuku Line, and (F-13) on the Tokyo Metro Fukutoshin Subway Line Narita Express The Narita Express train to Narita International Airport via Tokyo Station departs from Shinjuku Station. Odakyu Shinjuku Station Odakyu Odawara Line (to Hakone) Keio Shinjuku Station Keio Line (to Hachioji) Keio New Line (to Sasazuka, in Shibuya) Seibu Shinjuku Station North of the main Shinjuku Station complex is the separate Seibu-Shinjuku Station with trains to Kawagoe in Saitama Prefecture via Takadanobaba and Tokorozawa. Seibu Shinjuku Line