Map of Tokyo Subway ( Click the map to enlarge it! )
Tokyo has one of the most extensive mass transit systems in the world. It is clean, safe and efficient-and confusing. The confusion arises from the fact that several distinct railway systems operate within Tokyo - the JR East network, the two subway networks, and various private lines-and different route maps show different systems. Avoid rush hours if possible; trains get overcrowded very easily.
The defining rail line in Tokyo is the JR Yamanote Line, which runs in a loop around central Tokyo; being inside the Yamanote loop is synonymous with being in the core of Tokyo. Almost all inter-regional JR lines and private lines start at a station on the Yamanote. JR's lines are color-coded, and the Yamanote is green. The JR Chuo and Sobu lines run side-by-side, bisecting the Yamanote loop from Shinjuku on the west to Tokyo on the east. JR's other commuter lines, the Saikyo and Keihin-Tohoku, run off the rim of the Yamanote loop to the north and south. JR East has a good English information line, 050-2016-1603 or 03-3423-0111.
Tokyo has an extensive subway network with frequent trains, and these are primarily useful for getting around within the Yamanote loop. The Tokyo Metro runs nine lines: Ginza, Marunouchi, Hibiya, Tozai, Chiyoda, Yurakucho, Hanzomon, Namboku and Fukutoshin lines. Toei operates the Asakusa, Mita, Shinjuku, and Oedo lines. While the JR Yamanote Line is not a subway line, due to its importance as a major transportation artery in downtown Tokyo, it is usually featured on subway maps. In addition, there is a largely underground Rinkai Line, a private line which is operated by Tokyo Waterfront Area Rapid Transit or TWR, that passes through the island of Odaiba.
Announcements and signs are usually bilingual in Japanese and English, though in some areas frequented by tourists, signs in Korean and Chinese can also be seen.
A number of private commuter lines radiate from the Yamanote loop out into the outlying wards and suburbs, and almost all connect through directly to subway lines within the loop. The private lines are useful for day trips outside the city, and are slightly cheaper than JR. Among these, the most important to visitors is arguably the Yurikamome which offers great views on the way to the island of Odaiba.