Yes, my mistake - it's been a while! Definitely a local thing, and always with German pronunciation. There were a several words/phrases like that which got loaned into English. Doubly confusing because it wasn't always clear if the new word was Züri, regular Swiss-German, French but not Swiss-German, or High German. Had to be careful using new vocab in Germany!
BTW Hbf is a München thing, we call our beloved Zürich Hauptbahnhof just HB :-)