When I get back to my desktop, I’ll see if I can scare up an image.
The numbers in the boxes are the fare (in Yen) required to get to the indicated station from where you are (this map is from the Yurakucho station).
A number of companies run trains in Tokyo. This map is for the JR company lines. Other maps can show the places the different lines meet up.
When I get back to my desktop, I’ll see if I can scare up an image.