The Wienerwald Tunnel is a 13.35-kilometre-long railway tunnel near Vienna in service since 9 December 2012 passing underneath the northern part of Wienerwald between Gablitz and Mauerbach. It is part of a new 250 kilometres per hour section between Vienna and St. Pölten which is part of the Western Railway .
As part of the ongoing four-tracking of the Westbahn, Austria's most important rail corridor, the doubling of the Vienna — St. Pölten section gets two new tracks on an alignment without high grades and fit for high speeds, deviating far to the North of the original line. The single biggest superstructure is the tunnel to cross the Wienerwald mountains.
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