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In page Altstetten (Zürich):

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In 1900, the Limmattal-Strassenbahn opened an interurban electric tramway through Altstetten, connecting with Zürich's city trams at Letzigraben, which then formed the boundary between Zürich and Altstetten. Beyond Altstetten, the tramway continued to Schlieren, Dietikon and Weiningen. In 1931, the line was taken over by the Städtische Strassenbahn Zürich, operators of Zürich's city trams, by which time the line had been cut back to Schlieren. In the late 1950s the line was further cut back to Farbhof in the western of Altstetten, and it now forms part of city tram route 2.[1][2]