I don't know how significant this is from the mission briefing file: It seems that we should also determine where the message should be left. "Central train station" seems to suggest the central train station in Sochi to me. The thing is, I don't know if you're allowed to hop off and then hop back on the train (the same or another one) and continue to Adler. It also doesn't help that most of the trains stop at Sochi for 10 minutes or less (average is 9 minutes, some stop as quickly as 6 minutes), and I don't know if the subject will have enough time to run to the information desk and back. One of them does stop for 19 minutes at Sochi though (http://pass.rzd.ru/timetable/public...015&firstStation=Novosib Gl&lastStation=Adler).