Japan’s railway system is very advanced. Stations are set with short distance in between in Tokyo and Osaka areas so if you master using train, it will be very useful in travelling around. Here are list of train maps of Tokyo and Osaka area crated in Chinese and English.
Many popular sightseeing spots of Tokyo are concentrated in inside the Yamanote-line circle, along the JR Yamanote-line or in the downtown area along Sumida River. If you want to get to those spots, public transportation you can take would be JR lines, Tokyo Metro or Toei subway. What I would recommend is “Free Tickets”. They are period limited all-you-want-to-ride tickets to fully enjoy seeing various charms of the city and it’s of great value for money. How about going around attractive spots in Tokyo fully leveraging this special ticket?
JR East Japan: It’s a Japanese railway company, actually the largest transportation company in Japan. The total length of their train rails are the longest in the nation.
Subway: Tokyo Metro and Toei Subway are the two companies running the subway system of Tokyo.
(Simplified Chinese) http://www.tokyometro.jp/en/subwaymap/pdf/routemap_cn.pdf
(Traditional Chinese) http://www.tokyometro.jp/en/subwaymap/pdf/routemap_tcn.pdf
Osaka area too, like the Greater Tokyo has closely knitted network of subway, railway not just of JR but of private lines. It’s used by the local everyday as an essential means of their transportation. There are many train lines in Osaka, but the ones used most frequently in the central part of the city is JR Osaka Kanjo-sen line and Osaka-city Subway Midosuji-line. Off from Osaka to other major cities are Keihan, Hankyu, Kintetsu and Nankai private lines along with many more JR lines.
Keihan Train： Railway connecting Kyoto and Osaka
Kinki Nippon Railway: Railway connecting Osaka, Nara, Kyoto, Mie and Aichi prefectures