Totally Worthless Sans Connection
The Lite version is only good if you have an Internet connection, or for testing if you like the app before committing to the + version for $3.99.
But its a nice app, and has TONS of train info. Tokyo Metro is another good app, but it doesnt have some of the "outer" locations like Tokyo Disneyland.
Would be more helpful with directions to/from Narita Airport.
UnimpressedLuddite about
Tokyo Rail Map+ Lite • Yokohama, Saitama, Chiba