Most of trains in Japan have reserved seat and non reserved seat in ordinary cars. But some of you do not understand the difference between reserved seat and non reserved seat. And you may worry that all seats are full if you use non reserved seat.
Tokaido Shinkansen is the oldest and busiest Shinkasen line and it is operated between Tokyo, Nagoya, Kyoto and Osaka. Sanyo Shinkansen is operated between Osaka, Okayama, Hiroshima and Hakata (Fukuoka). Both lines are connected each other. Many trains, “Nozomi” that is the fastest train on Tokaido-Sanyo Shinkansen, run from Tokyo to Hiroshima and some of those run to even Hakata.
Most of Hikari run between Tokyo and Shin-Osaka, But some of those run to Okayama and Hiroshima.
Sanyo Shinkansen connected to Kyushu Shinkansen at Hakata. Many trains, Mizuho and Sakura are operated between Shin-Osaka and KUmamoto or Kagoshima-Chuo directly. Please see the post, Kyushu Shinkansen to get details.
Shinkansen (新幹線) is high speed train service that is operated by JR. It is one of the fastest train in world and sometimes called “Bullet Train”. JR has this high speed train network throughout Japan. You can save lots of your trip time by using this train system.
If you use Japan Rail Pass, you have to understand what Japan Railway is. In Japan, there are so many developed railway networks. And especially in Tokyo area and Kansai area, there are many private train companies. Those are NON Japan Railways and are not covered by JR deals, such as JR Pass with a few exceptions.