 The Mittenwalde line was closed until 17 May 1945, when the bridge over the Teltow Canal was repaired by the Red Army.In September 1946, the Soviet occupying administration took possession of the portion of the line outside Berlin under eminent domain and transferred its operation to the Brandenburg State Railways, and in the Berlin Blockade of 1948/49, the line was severed at the boundary with the American sector.of line with some sidings within Berlin remained unaffected, and the company had constructed a extension to Tempelhof Airfield which could then be used to transport coal flown there in the Berlin Airlift, avoiding the East Berlin-controlled Deutsche Reichsbahn.