Scene: a hot Tokyo day. You have just checked out of your hotel and are dragging your and your partner’s rolling bag across town to the train station. After navigating the remarkably well laid out station, you arrive at your train which is promptly on time. You find your seat and load your bags into the designated storage spot.
30 minutes or so into the journey, an attendant wheels a cart down the car. Despite understanding some Japanese, you point at a bento bento box and a can of beer and swipe your card. Not quite hungry yet, you open the beer and pour it into the provided cup. A few minutes later, the train begins to slow for the next station. You watch the beer closely, ready to grab it and take a big sip if it seems likely to spill. The train drops from ~200mph to a stop, picks up passengers and then ramps back up to speed. The closest the beer ever was to spilling was when you were pouring it into your cup.
You open the bento box and enjoy a delicious lunch as scenery silently speeds past you.
(incidentally, that’s the coach experience on the Shinkansen. I have yet to ride in the Green Car)
(also, as long as you are not a Japanese citizen and remembered to buy a JR Pass at home before leaving for Japan, your high speed rail journey cost nothing beyond the $230 you paid for the unlimited travel rail pass. I think we paid more than that for the Italian HSR between Rome and Florence)