Pre-existing situation A private tramway company, the
Strassenbahn Zürich-Oerlikon-Seebach (ZOS), opened a line from Zürich Seebach to
Glattbrugg in 1908. At the time, this area was sparsely inhabited and the line was not a commercial success. The link was replaced by a bus service in 1931. In the period following
World War II, the
Glattal area experienced a rapid boom as population and industry spilled over from nearby
Zürich. The development was accelerated by the inauguration of
Zurich Airport near
Kloten in 1953. The economic growth of the Glattal region is continuing to this day. One of the consequences of the rapid transformation is rising
traffic congestion. • Phase 2 branched off from phase 1 and ran to
Zurich Flughafen, Bahnhof via
Opfikon and
Glattbrugg. Construction began in 2006 and the line was opened in December 2008. The route is operated as an extension of city route 10. • Phase 3 saw the phase 1 line extended from Auzelg via
Wallisellen to
Bahnhof Stettbach in
Dübendorf. Construction began in 2008 for a 2010 opening. Trams now run from Zurich Airport to Bahnhof Stettbach as the new route 12. The
Federal Council approved an extension on April 6, 2022. ==Operation==