# S21

> line of the Zurich S-Bahn (Regensdorf-Watt - Zürich Oerlikon - Zürich HB)

**Wikidata**: [Q7388225](https://www.wikidata.org/wiki/Q7388225)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/S21_(ZVV))  
**Source**: https://4ort.xyz/entity/s21