Vienna pre-metro

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The Vienna pre-metro tramway system was built on separated sections in the 1960s. The underground sections are called Untergrundstrassenbahn (German for underground tramway) or sometimes abbreviated U-Strassenbahn, USTRAB or USTRABA . The pre-metro tunnels are maintained and used by the Wiener Linien, operator of the tramway lines. One section is used as well by the Wiener Lokalbahnen (WLB), the operator of a regional tram-train service.

After one large section close to the center of Vienna city was converted to the modern Vienna U-Bahn system, the second larger section, in the area of the south of Vienna, is still in operation as a pre-metro tramway tunnel.^[1][2] In total, five sections have been built.