Zurich Airport
Zürich Airport railway station is located underneath the "Airport Centre". The station has frequent Zürich S-Bahn services, plus direct InterRegio, InterCity, and Eurocity services, to many places including Basel, Bern, Biel/Bienne, Brig, Geneva, Konstanz, Lausanne, Lucerne, Munich, Romanshorn, St. Gallen, and Winterthur. There are some 13 trains per hour to Zürich Hauptbahnhof, Zürich's main city centre station, with a journey time of between 10 and 15 minutes. By changing trains at Hauptbahnhof, most other places in Switzerland can be reached in a few hours.
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.