In March, 2018, new rail pass, “Greater Tokyo Pass” was launched in overseas tourist market. This new deal covers all subway lines in Tokyo and major non JR railway services in Tokyo and surrounding area. Both Haneda and Narita airports are covered by this pass. You can start using this pass right after you arrive in Japan.
You found this post. Because you are overwhelmed by the train system in Tokyo, right? I understand it is very complicated because there are many train lines and many different railway companies. Actually it is very very hard to find the route for even the local tourist.
And also there are lots of deals available but you may not be able to find the coverage of the pass.
In this post, I will show you all subway lines and JR lines in downtown core of Tokyo. And I will also tell you about the train system surrounding in Tokyo too. Because some of trains that come from outside Tokyo go to downtown Tokyo via subway line. This is actually one of the reason why it is so difficult to understand train system in Tokyo.