The Tokaido Shinkansen service requires regular inspection of the track to ensure it is up to the high standards required of high speed service. JRC operates an inspection train called Doctor Yellow. It is a highly instrumented version of the current trains. I have seen the current Doctor Yellow when I was at one of JRC’s maintenance facilities. However, the original Doctor Yellow was based on the Series 0 trains. It is now preserved in the SC Maglev museum in Nagoya along with many of the other Shinkansen designs.