Lainz Tunnel

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The Lainz Tunnel (German: Lainzer Tunnel) is a 12.8-kilometre-long, double-track railway tunnel in Vienna. It forms one part of a wider tunnel network that includes the neighbouring Wienerwald Tunnel, it connects Austria's Western, Southern, Eastern and Donauländebahn railways and greatly simplifies international and national connectivity in Vienna. The Lainz Tunnel has been in service since 9 December 2012.

The Lainz Tunnel was constructed during the 2000s and early 2010s as part of a major expansion of Austria's most important rail corridor, it was intentionally built as a measure to minimise gradients and facilitate high speed traffic, as well as for better accessibility to the newly constructed Wien Hauptbahnhof central station in Vienna. It is divided into two distinct sections, comprising a single bore accommodating a pair of tracks and two parallel bores each carrying a single track; it also meets up with several other neighbouring tunnels, including the Wienerwald Tunnel.