[snowsislander]

... instead of the Marunouchi Line where (if I remember correctly) the attack took place.

I believe that the Hibiya-sen and the Chiyoda-sen were also hit. Looking at the Wikipedia page on the attack, it appears that greatest death toll was on the Hibiya line.

[gaijin]

I was ON the Hibiya-sen when it happened -- utter pandamonium.

No, I didn't go to the hospital.