S45 of the Vienna S-Bahn is an electrified commuter rail service operating in Vienna Austria. It is the only S-Bahn route to operate entirely within the city limits and is also the most frequently operated S-Bahn service with intervals of 10 minutes during weekdays. The S45 opened on 31 May 1987 and uses the route of the original Stadtbahn and still bears the architecture of the Stadtbahn.
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