The Shinkansen, colloquially known in English as the bullet train, is a network of high-speed railway lines in Japan. Initially, it was built to connect distant Japanese regions with Tokyo, the capital, in order to aid economic growth and development.
The shinkansen network consists of multiple lines, among which the Tokaido Shinkansen (Tokyo - Nagoya - Kyoto - Osaka) is the oldest and most popular. All shinkansen lines (except the Akita and Yamagata Shinkansen) run on tracks that are exclusively built for and used by shinkansen trains. Most lines are served by multiple train categories, ranging from the fastest category that stops only at major stations to the slowest category that stops at every station along the way.
Most shinkansen trains offer both non-reserved seats and reserved seats in separate cars. Only the Hayabusa, Hayate and Komachi trains on the Tohoku Shinkansen and Hokkaido Shinkansen and the Kagayaki trains on the Hokuriku Shinkansen are fully reserved and do not carry non-reserved seating. All seats in Green Cars are reserved.
Seat reservations allow you to secure a seat and travel with peace of mind. They can be made for all shinkansen trains, but are not mandatory on the trains that also carry non-reserved seating. Only the Hayabusa, Hayate and Komachi trains along the Tohoku Shinkansen and Hokkaido Shinkansen, and the Kagayaki trains along the Hokuriku Shinkansen require seat reservations
Seat reservations can be done from the JR Office & it is simple and Staffs are very friendly.
Japanese people are the kindest people I ever met. They are ready to help you with the best possible ways and irrespective of not knowing the language of English - they will attempt to help you.
I had an instance where while crossing the road - one of my hand gloves came out of my Jeans pocket. One of the Japanese lady without hesitating, came forward and handed me my hand gloves. I was so thankful to her. This was the first day in Japan.