The S-Bahn Berlin reports that because of the fire “the train service on the S7 line between Grunewald and Wannsee is still interrupted”. Between Wannsee and Potsdam Hauptbahnhof, the S7 line would only run every 20 minutes.
The S-Bahn recommends the following bypass options:
Regional and long-distance trains are also still affected and will not run between Charlottenburg and Wannsee/Potsdam Hauptbahnhof.