Zurich (German: Zürich, German pronunciation: [ˈtsyːrɪç]; Swiss German: Züri ) is the largest city in Switzerland and the capital of the canton of Zurich. It is located in north-central Switzerland at the northwestern tip of Lake Zurich. The municipality has approximately 390,000 inhabitants, and the Zurich metropolitan area 1.83 million. Zurich is a hub for railways, roads, and air traffic. Both Zurich Airport and railway station are the largest and busiest in the country.
Permanently settled for around 2000 years, the history of Zurich goes back to its founding by the Romans, who, in 15 BC, called it Turicum. However, early settlements have been found dating back more than 6400 years ago. During the Middle Ages Zurich gained the independent and privileged status of imperial immediacy and, in 1519, was the place of origin and centre of the Protestant Reformation in German-speaking Switzerland, led by Ulrich Zwingli.
Zurich is a leading global city and among the world's largest financial centres. The city is home to a large number of financial institutions and banking giants. Also, most of the research and development centres are concentrated in Zurich and the low rate of tax attracts overseas companies to set up their headquarters there.
A tram (also known as a tramcar; a streetcar or street car; and a trolley, trolleycar, or trolley car) is a rail vehicle which runs on tracks along public urban streets (called street running), and also sometimes on separate rights of way. Trams powered by electricity, which were the most common type historically, were once called electric street railways. Trams also included horsecar railways which were widely used in urban areas before electrification.
Tram vehicles are usually lighter and shorter than conventional trains and rapid transit trains. However, the differences between these modes of public transportation are often indistinct. Some trams (for instance tram-trains) may also run on ordinary railway tracks, a tramway may be upgraded to a light rail or a rapid transit line, two urban tramways may be united to an interurban, etc.
Most trams today use electrical power, usually fed by an overhead pantograph; in some cases by a sliding shoe on a third rail or trolley pole. If necessary, they may have several power systems. Another power source is diesel oil; a few trams use electricity in urban streets, and diesel in more rural environments. Steam, petrol (gasoline), gas and draft animals have historically been used as power sources. Horse and mule driven trams do still occur, mostly for the tourist trade. Certain types of cable car are also known as trams.