animum mutare released railgun volume 7 scanlations. kongou's flashback was the most modified part.
there's this page that caught my attention though:
I get the feeling that his high school friend was Kamijou Touya. travelling around the world and doing stupid things sounds a lot like Touya more than Tabikake (the only other world travelling person we know) imo.
also, more spoiler pics:
http://i.minus.com/iblWd7ObxswGRU.png
http://i.minus.com/iblWd7ObxswGRU.png
http://i.minus.com/idyt1IeUA9A23.png
http://i.minus.com/ib7XRmci8YZyh.png