With more than 14,000 units built, Tatra T3 is the most widely produced tram model in history. Zürich tram multiple-unit train. A tram (also known as a streetcar or trolley in the United States) is a type of urban rail transit consisting of either individual railcars or self-propelled multiple unit trains that run on tramway tracks on urban public streets; some include segments on segregated ... More @Wikipedia
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