The most highly frequented single line in Vienna is the S45 Vorortelinie, which translates to "Vienna Suburban Line".
The localities along this line all lie within the city proper, although they had been independent until the late nineteenth century, when they were incorporated, six years before this line opened.
Originally part of Otto Wagner's federally operated Stadtbahn, this line was not taken over by the city with the rest of the network in 1925.
The line was subsequently closed in 1932.
Although still used for freight traffic for several decades afterwards, the line would not see passenger traffic until 1987, when it was reopened as part of the S-Bahn after extensive renovation.

Many of the original Otto Wagner stations are still standing and still in use.
However, two of the present stations, Breitensee and Oberdöbling were demolished after the original line's closure and rebuilt in a different style by architects Alois Machatschek and Wilfried Schermann.
One new station, Krottenbachstraße was added to the refurbished line, and two of the original line's stations, Baumgarten and Unterdöbling, which had also been demolished, were not replaced.
Rebuilding Unterdöbling station is proposed for the near future, as is extending the line south to the Reichsbrücke.
The line was extended from Heiligenstadt to Handelskai in 1996, to allow for an easy connection to line U6 of the Vienna U-Bahn.

The Vorortelinie runs at headways of 10 minutes (daytime on weekdays), and is shown on maps (including U-Bahn maps) as a light green line.
The most highly frequented single line in Vienna is the S45 Vorortelinie, which translates to "Vienna Suburban Line". The localities along this line all lie within the city proper, although they had been independent until the late nineteenth century, when they were incorporated, six years before this line opened. Originally part of Otto Wagner's federally operated Stadtbahn, this line was not taken over by the city with the rest of the network in 1925. The line was subsequently closed in 1932. Although still used for freight traffic for several decades afterwards, the line would not see passenger traffic until 1987, when it was reopened as part of the S-Bahn after extensive renovation.
Many of the original Otto Wagner stations are still standing and still in use. However, two of the present stations, Breitensee and Oberdöbling were demolished after the original line's closure and rebuilt in a different style by architects Alois Machatschek and Wilfried Schermann. One new station, Krottenbachstraße was added to the refurbished line, and two of the original line's stations, Baumgarten and Unterdöbling, which had also been demolished, were not replaced. Rebuilding Unterdöbling station is proposed for the near future, as is extending the line south to the Reichsbrücke. The line was extended from Heiligenstadt to Handelskai in 1996, to allow for an easy connection to line U6 of the Vienna U-Bahn.
The Vorortelinie runs at headways of 10 minutes (daytime on weekdays), and is shown on maps (including U-Bahn maps) as a light green line.
Vienna S-Bahn