Catwalker

This is the tram station accross
from the south (Shinkansen) exit
of Hiroshima station, this will take
you right to the station across from
the atomic bomb dome.



In my case, it took me to and from
Dobashi station, which is just
5 minutes walk (even with
heavy luggage) from the J-Hoppers hostel where I stayed.

A departing Bullet train.






An arriving Shinkansen (mine
came in just after this one)




The Japan Rail Pass really is the way to go. You can't
use some trains (such as the Nozomi) but it doesn't
matter, plenty of perks, reserve seats (or not - you
can take your chances with an unreserved seat car).
And use a number of other JR lines, such as the
Tokyo and Osaka loop lines - for free. These tickets
do pay for themselves quickly if you are doing
a lot of traveling.