Winterthur railway station
Winterthur is Switzerland's fifth busiest station, and is a major node between Switzerland's largest railway nucleus in Zürich and places in Eastern Switzerland (such as St. Gallen and Schaffhausen), as well as Germany (Munich), and Austria (Vorarlberg). The station is served by trains on Zürich's suburban S-Bahn network, as well as by regional and intercity trains, with most through passenger trains making a stop. It is also connected with Zürich's airport railway station Zürich Flughafen, which can be reached in about 15 minutes about every 8 minutes. Zürich Hauptbahnhof can be reached with up to 16 direct connections per hour and the fastest connection takes only 22 minutes (S12). The station has 9 standard gauge platforms (numbered 1-9).
Zürich Altstetten railway station
For most of the day, line S3 provides 2 train per hour (tph) to Zürich Hauptbahnhof and Wetzikon and 2 tph to Dietikon with 1 tph continuing to Lenzburg and Aarau. Line S5 provides 2 tph to Zürich Hauptbahnhof and Uster and 2 tph to Affoltern am Albis and Zug. Line S12 provides 2 tph to Zürich Hauptbahnhof and Winterthur and 2 tph to Dietikon, Baden and Brugg. Line S15 provides 2 tph to Zürich Hauptbahnhof and Hinwil and 2 tph to Affoltern am Albis. Line S19 provides 2 tph to Zürich and Effretikon and 2 tph to Dietikon, with some peak hour trains extended to Koblenz. Additionally there is a single InterRegio train per hour between Zurich Airport and Basel SBB that calls at Altstetten in both directions.