S45 is a line on the Berlin S-Bahn.^[1] It operates from Flughafen BER beneath Berlin Brandenburg Airport to Südkreuz^[2] via:

• a very short section of the Outer ring, opened in 1951 and electrified in 1983,
• a short section of the former Outer freight ring opened in the early 1940s and electrified in 1983,
• the Görlitz line, opened in 1866 and electrified in 1929,
• the Baumschulenweg–Neukölln link line, opened on 8 June 1896 and electrified in 1928 and
• the Ring line, completed in 1877 and electrified in 1926.

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Overview
Locale	Berlin
Service
System	Berlin S-Bahn
Operator(s)	S-Bahn Berlin GmbH
Rolling stock	DBAG Class 483 DBAG Class 484
Technical
Electrification	750 V DC Third rail
Route map Berlin S45 Legend Flughafen BER Waßmannsdorf Schönefeld (bei Berlin) Brandenburg–Berlin state border Grünbergallee Altglienicke Teltow Canal Adlershof Johannisthal to Spindlersfeld Schöneweide Britz Canal Baumschulenweg Köllnische Heide Neukölln Hermannstraße Tempelhof Südkreuz This diagram: view talk edit

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A southern extension from the former terminus at the Schönefeld Airport station has been constructed prior to the opening of the new Berlin Brandenburg Airport.^[3] The rail extension includes include two new stops: Waßmannsdorf and Berlin Brandenburg Airport.^[4][5] Due to the opening of the new airport, Schönefeld Airport station has been renamed to "Flughafen BER - Terminal 5 station". When Terminal 5 was closed, the station has been renamed to Schönefeld (bei Berlin) station.