The seating and facilities in “Ordinary” or “Tourist” class carriages of JR trains, particularly the Bullet trains, is quite roomy and comfortable. “Green” or first-class carriages offer more room (eg. 2 + 2 seats across a carriage, compared to 2 + 3 seats in Ordinary class). But bear in mind that in Green class, seat reservation is compulsory – non-reserved carriages do not exist in Green class.