The construction of a second S-Bahn trunk route (a second main tunnel route through the centre of Munich) with a second S-Bahn station has begun in 2018. While the new U-Bahn line, designated as U9, has been planned and approved, the construction has yet to begun and would not be completed until 2035 at latest. However, the construction of third U-Bahn station for U9 line has been incorporated at the same time to expedite the completion of three projects at the same site.