ETCS is planned, but does not show as "ETCS under construction" (see https://infrastruktur.oebb.at/de/geschaeftspartner/schienennetz/dokumente-und-daten/etcs-zugbeeinflussung/etcs-ausbau)
also affects: e.g. Westbahn (Hütteldorf - Westbahnhof), Line S45