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 Hardbrücke railway station
The station sits in the approach to Zürich Hauptbahnhof station, on the Zürich–Baden line near its junction with the Käferberg tunnel variant of the Zürich–Winterthur line, and to the north of the through tracks that carry long distance passenger and freight trains. It lies below the Hardbrücke, a road bridge that crosses the rail tracks and forms an important north-south connection within the city. The station has two side platforms and a central island platform served by four tracks, with the two inner tracks on the line to via the Käferberg Tunnel, and the two outer tracks on the line to . The line to Oerlikon is at a higher level, and thus the platforms are not all at the same level.