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The GT4 (from German: Gelenktriebwagen 4-achsig, which translates as 4-axle articulated tramcar) is an articulated tram vehicle built by Maschinenfabrik Esslingen from 1959 until 1965. 380 GT4 trams were produced of which 350 were delivered to the Stuttgarter Strassenbahnen, the public transport operator of Stuttgart.

source: https://en.wikipedia.org/wiki/Maschinenfabrik_Esslingen_GT4