I thank God that I own a car in a congested city where driving is one heck of a task because I hate the overcrowded metro trains and buses where we have to forcefully stand close to other people. And that is the reason, if I am ever gonna go to Japan, then I will keep it in my mind to not use their subway ever.
The subway trains in Tokyo are enormously crowded and comes fully packed even the trains come every 5 minutes. The problem has turned out to be so serious that as a matter of fact, subway station workers literally push the passengers inside to fit everyone and then close the doors. Also, clearly, there is completely zero individual space inside the trains.