Most Shinkansen “bullet trains”have Ordinary (second class) cars, and Green (first class) Cars.
Green car seats and both reserved and non-reserved ordinary car seats. Usually Green car is quiet and less crowed, and the train feels more spacious and comfortable. Shinkasen seats on the Green car have 4 rows (2 rows + 2 rows) and Ordinary car have 5 rows of seats ( 2 rows + 3 rows) that width of the green seat is wider. The green car has a deeper reclining angle and you can recline the seat deeper than the Ordinary car.
※Some Sanyo and Kyushu Shinkansen have 4 rows of seats in a standard car, which is the same width as a green car.
※During busy times, the train is almost full, and some people have choice to take the green car because the ordinary car is full, so tranquility is not guaranteed.
Green Car Seats Ordinary Car Seats