Volume 2: "U7 - Berlin" is the next release continuing the successful product series " World of Subways" introducing famous subway lines around the world to all subway enthusiasts. After Vol. 1, Vol. 2 contains the route U7 of Berlin`s subway. The ultimate source of patches & addons for World of Subways, Volume 2. Volume 2 was the next product in continuing the successful World of Subways series. It takes place in the Berlin U-Bahn's U7 line, the longest line in the system covering km ( mi) and 40 stations between Rathaus Spandau and Rudow. Unlike the other.