In this video, RailKingJP and his son visit car 951-1, which is on display across from the Railway Technical Research Institute in Kokubunji, Tokyo. It appears that during the daytime, the car is open to the public, and has displays and a small library inside. I'll check it out when I drop off my résumé at RTRI
https://en.wikipedia.org/wiki/Class_951_Shinkansen
location: https://goo.gl/maps/LGaZoVmHu8p