The story
Steam navigation started on Lake Zurich in 1834, when Franz Carl Caspar and Johann Jakob Lämmlin founded a new company (Caspar und Lämmlin, Unternehmer der Dampfschiffahrt auf dem Zürcher- und Walensee) and ordered their first ship from William Fairbairn of Manchester, England. The Minerva entered service the following year. When the city fortifications were abolished, the then called Bauschänzli bastion remained intact, and served from 1835 to 1883 as the landing site for the first steamboats on the lake, later provided by the Zürichsee-Schifffahrtsgesellschaft.
Over the years, various other companies started operating steam ships on the lake, and various mergers took place, until the entire fleet was taken over by the Swiss Northeastern Railway (NOB) in 1874. The NOB also owned most of the railway network around the lake, and this monopoly led to consumer resistance, and to the formation of the Zürcher Dampfbootgesellschaft (lit. 'Zurich Steamship Company') in 1890/91. In order to operate a tram-like suburban traffic, a series of nine screw steamships was ordered.
When the NOB became part of the Swiss Federal Railways in 1903, the Zürcher Dampfbootgesellschaft took over its fleet of ships on Lake Zurich. This included the large paddle steamer Helvetia. In 1909 and 1914, it ordered two further large paddle steamers, which were to become today's Stadt Zürich and Stadt Rapperswil respectively. In 1934 the Zürcher Dampfbootgesellschaft introduced its first successful motor ship, the Etzel, and from then on the fleet became increasingly motorized.
For the Swiss National Exhibition of 1939, four sister motor ships named after water birds, the Taucherli (Eurasian coot), Schwan (Swan), Möve (gull) and Ente (duck), were brought into service. These vessels provided a connecting service between the two exhibition sites, at Wollishofen and Zürichhorn. The Second World War brought economic difficulties, but the cross-lake services were maintained. As a consequence of the transition from steam power to motor vessels, the company changed its name to Zürichsee Schifffahrtgesellschaft, or ZSG for short, in 1957.
In 1990, the ZSG became part of the Zürcher Verkehrsverbund (ZVV), the public transport network established in the same year, accepting the ZVVs common tickets and tariffs.
In 2009 there was a centennial exhibition on board Stadt Zürich at Zürich-Bürkliplatz. On 12 June 2009, exactly 100 years after the maiden voyage of the steamship Stadt Zürich, its anniversary trip with invited guests and its sistership Stadt Rapperswil was celebrated., and in 2014 for its then 100 years aged sistership.
From Wikipedia’s article on ZSG, shared under CC BY-SA 4.0.4