With almost 14,000 produced units between 1960 and 1999, the ČKD Tatra T3 tram car is still the most widespread of its type in the world (2022).

https://en.wikipedia.org/wiki/Tatra_T3

Photo credit: Praha, Tatra T3SUCS č. 7290. Praha, Tatra T3SUCS č. 7290/CC BY-SA 4.0, https://commons.wikimedia.org/wiki/File:Praha,_Tatra_T3SUCS_%C4%8D._7290.jpg

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