Vienna's Missing Metro Line

Why is there a line missing from Vienna's metro network? Let me explain.

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Sources:
https://de.wikipedia.org/wiki/U-Bahn-...)
https://de.wikipedia.org/wiki/U-Bahn_...
https://homepage.univie.ac.at/horst.p...
https://homepage.univie.ac.at/horst.p...
https://homepage.univie.ac.at/horst.p...
https://homepage.univie.ac.at/horst.p...
https://www.mapnificent.net/vienna/#1...
https://www.geschichtewiki.wien.gv.at...
https://www.geschichtewiki.wien.gv.at...
https://www.mediathek.at/portaltreffe...
https://web.archive.org/web/200503180...
http://wiener-untergrund.at/verworfen...
http://wiener-untergrund.at/planungen...


#Vienna #U5 #Subway #Metro #Austria