The story
In the first half of the 20th century, the region between Lake Zürich and the Zürcher Oberland was served by a number of rail lines. These included a standard gauge steam railway, the Uerikon-Bauma-Bahn, and two metre gauge electric tramways, the Wetzikon-Meilen-Bahn and the Uster-Oetwil-Bahn. These three lines were operating with large financial losses, and it was decided to replace them with buses. The VZO was founded to operate these replacement service, and over the years more routes in the area were added.
In 2008, the VZO started operating in Rapperswil-Jona, where it now operates five routes of the Stadtbus Rapperswil-Jona on behalf of the municipality of Rapperswil-Jona.
From Wikipedia’s article on Verkehrsbetriebe Zürichsee und Oberland, shared under CC BY-SA 4.0.4
