The S3 is a regional railway service of the Zürich S-Bahn on the Zürcher Verkehrsverbund (ZVV), the Zürich transportation network. It is operated by Swiss Federal Railways.
Up until December 2018, the S3 operated via the Zürich–Baden railway as far as Dietikon, instead of turning north to Bülach. Alternate trains continued further along the Zürich to Olten line, from Dietikon to Aarau, in the canton of Aargau. An extended replaced the S3 between Hardbrücke and Aarau. == Rolling stock ==
Over the core route between Wetzikon and Hardbrücke, the normal frequency is one train every 30 minutes. A limited number of trains operate to and from Bülach during peak hours. A journey over the full length of the service takes 60 minutes. == See also ==