S-Bahn Mitteldeutschland represents an enlargement of the previous Leipzig-Halle S-Bahn. It is an electric rail public transit system operating in the metropolitan area of Leipzig-Halle, Germany. This S-Bahn (German abbreviation for Stadtschnellbahn - literally, "urban rapid [rail]road") network developed from two separate S-Bahn networks of Halle (Saale) and Leipzig, which were established separately in 1969 and then linked in 2004. With the opening of the Leipzig City Tunnel on 15 December 2013 as a new artery, the network was extended to the federal states of Thuringia and Brandenburg. The locomotive-hauled double-decker trains had been replaced by electric multiple unit Bombardier Talent 2 trains.