Originally Posted by
allset2travel
In the Tokyo Station, the Tokaido-Sanyo Shinkensan platforms are #21-24. Signage is quite good throughout.
As of August 2009 Tokyo station has platforms #1-23 above ground as you will see on
the map I posted earlier.
Platforms #14-19 are for Tokaido and Sanyo Shinkansen and platforms #20-23 are for Tohoku, Yamagata, Akita, Joetsu, Nagano Shinkansen. Two sets of underground platforms including those used by Narita Express are numbered separately.