Its feel luxury. The JR East E655 series is designed for VIP transportation,and a replacement for the retired royal train. It is also named "Nagomi", for reference.
Royal person(s) in transport
Apart from transporting royal person, the train can still be utilized as group reversed train, which is expensive to book. In other word, you can still get a chance to ride on it, if you are willing to pay a lot.
Your majesty, your trip cancel my train I used to ride.
This is the E655-1 (TR) car, which can only ride by royal person.
Interior of the train....not as luxury as I thought?
Well, to be honest, I think riding (luxury one) highway bus is better than taking the E655 series.
When are buses better than trains? Buses are much more shaking and swaying than trains. There even is a term for the advantage of railbound vehicles - "Schienenbonus" in German, literally "track bonus".
https://de.m.wikipedia.org/wiki/Schienenbonus
money.