Any Nozomi train running on Tokaido Shinkansen is composed of 16 cars;
only 3 cars are for non-reserved seats: Car Numbers 1 to 3.
When the train goes westbound / eastbound, Car Number 1 is at its head / tail.
- Example of signage for Tokaido Shinkansen in Tokyo Station
https://www.japan-guide.com/g3/2018_how_sign.jpg- Map of Tokyo Station
https://global.jr-central.co.jp/en/info/station/_img/tokyo.jpgIn Tokyo Station, there are two separate Shinkansen zones,
of JR Central (for Tokaido Shinkansen)
and of JR East (for Tohoku, Joetsu and Hokuriku Shinkansen).
The zone for Tokaido Shinkansen
is indicated by a blue-and-white pictgram symbolizing Shinkansen train's head.
Shinkansen South Transfer Gate (No. 9 in the map)
is close to the positions for Car Numbers 1 to 3.
When you get into the non-Shinkansen zone from outside the entrance gates,
Yaesu South Ticket Gate (No. 5 in the map) or
Marunouchi South Ticket Gate (No. 12 in the map) sound good.
You see Tokaido and Sanyo Shinkansen written together in signages,
becuase many trains go also on Sanyo Shinkansen (of JR West).
On these two Shinkansen lines, wetbound trains each have one odd number;
Nozomi trains of odd numbers larger than 200 go as far as to Shin-Osaka Staion,
which is the boundary station between the two lines.