The Anhalt suburban line (German: Anhalter Vorortbahn) is a suburban railway in Berlin and Brandenburg. It originally ran from Potsdamer Ringbahnhof in Berlin over the Berlin–Halle railway (also called the Anhalter Bahn or Anhalt Railway). With the opening of the Berlin Nord-Süd Tunnel in 1939, this service was abandoned. Subsequently, the electric services ran to the south parallel with the long-distance tracks of the Anhalt Railway. Its terminus was at Berlin-Lichterfelde Ost until the 1940s. In 1943, it was extended to Lichterfelde Süd for electric trains and to Ludwigsfelde for steam trains. The construction of the Berlin Wall in 1961 stopped services at the outskirts of Berlin. In 2005, a new Berlin-Lichterfelde Süd–Teltow Stadt S-Bahn line was opened.