It's inspired by the Forth Rail Bridge, so just imagine a much bigger version with accommodation, defensive armaments, different level rail decks etc built into the structure.
How are you finding the book in general? I probably read it about 10 years ago and remember really liking it. I've always found him a bit hit and miss though.
Has anyone tried to illustrate Iain Bank's 'The Bridge'? Fanfic, cartoon, film whatever...
Finding it hard to get the visuals right in my head.