The section Puntigam - Kalsdorf on the main line Wien - Graz - Spielfeld-Straß - Slovenija is actually being double-tracked. 
Photo taken from IC 158 just north of Kalsdorf.
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The line had had two tracks once, but the second track has been dismantled south of Puntigam in the 1950ies and 1960ies due to low traffic.
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2004-02-09
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Helmut Uttenthaler, helmut.uttenthaler@gmx.at