The following pages are mainly of interest for transport geeks. They include a history of the networks, historical maps and photos. A brief description of the current U-Bahn and S-Bahn lines including an up to date map can also be found here. Another brief list of all the U-Bahn, S-Bahn and R-Bahn lines is available here. Try The Subway Server for finding arbitrary routes across the network.
The (Verkehrsgemeinschaft Berlin-Brandenburg) is a consortium of 7 different corporations offering public transport services in the cities of Berlin, Potsdam, and neighbouring rural counties. They collaborate in order to provide a common fare system, common line numbering and routing system, joint time tables and passenger information. All public transport in Berlin and some neighbouring counties is now part of the VBB system.
That sort of collaboration is fairly new for Berlin; in West German cities it has existed for 20 years or more.
Within the VBB, the following means of transport are available: