Zürich Seebach railway station
Trains on the S6 provide a half-hourly connection to Zürich Hauptbahnhof station, taking 12 minutes for the journey via the southern connector and Oerlikon station. In the opposite direction, S6 trains continue to Baden station, taking 28 minutes for the journey. The station also sees significant through freight traffic, most of which takes the Furttal line in order to avoid passing through central Zürich, using the northern connector onto or off the Zürich–Winterthur line.
Zürich Hauptbahnhof
From the opening of the station, the railways of northern Switzerland developed rapidly, and by 1853 the Swiss Northern Railway had been merged into the Swiss Northeastern Railway ("Schweizerische Nordostbahn"; NOB). Also in 1853, the tracks in the station were regauged to the standard gauge () that is still used by all lines in the station. In 1856, the NOB completed its line from the station to Winterthur via the Wipkingen Tunnel and Oerlikon. In 1858, the NOB completed its line from Baden via Brugg to Aarau, where it connected with the Swiss Central Railway ("Schweizerische Centralbahn"; SCB), thus providing connections to Basel, Solothurn and Lausanne.