Here is a link for a great article in National Geographic magazine on the new railroad connecting Baku (The Caspian) to Eastern Turkey (The Black Sea). The article emphasizes economic advantages for the local populations especially the Georgians. It also covers a bit of the history/tensions in the Caucasus and the ramifications for this particular project. If the link doesn't work, let me know and I can send you the article.
PS It also has some beautiful pictures!