So that everyone knows and takes appropriate measures, there has been a maintenance incident on the Tokaido Shinkansen (two maintenance trains collided, one derailed). As a consequence, as of July 22, 11am, the service has been suspended on the Tokaido Shinkansen with no timeline for resumption (and resumption on July 22 being unlikely).
Edit: traffic has been reestablished today (23), with some additional trains in the early hours, but JR central warns that trains and stations will be extremely crowded and suggests to postpone travel for those who can.
by Titibu