Chikatetsu (地下鉄) Japanese for subway.
JR Short for Japan Rail, the once national and now private train operator.
Midori-no-madoguchi (緑の窓口; green window) Found in larger JR train stations, these are ticket counters for purchasing long-distance (including bullet-train) tickets. Credit cards accepted.
Pasmo (パスモ) Pre-paid rechargeable train pass, good on all city subways, trains and buses. Also works on vending machines and kiosks in stations and at some convenience stores. Sold at subway and commuter line stations.
Suica (スイカ) Interchangeable with Pasmo, but sold at JR train stations.
Ginza subway line Shibuya to Asakusa, via Ginza and Ueno. Colour-coded orange.
Hibiya subway line Naka-Meguro to Ebisu, Roppongi, Ginza, Akihabara and Ueno. Colour-coded grey.
JR Yamanote line Loop line stopping at many sightseeing destinations, such as Shibuya, Harajuku, Shinjuku, Tokyo and Ueno. Colour-coded light green.
JR Chūō line Express between Tokyo Station and Shinjuku, and onwards to points west. Colour-coded reddish-orange.
JR Sōbu line Runs across the city centre connecting Shinjuku with Iidabashi, Ryōgoku and Akihabara. Colour-coded yellow.
Yurikamome line Elevated train running from Shimbashi to points around Tokyo Bay.