There are no S3 trains to Hohenbrugg. S3 ends/starts in Fehring, trains continue then as "R" (regional train without line number) to Hohenbrugg, Jennersdorf and Hungary, although it is marked as a pink line as well in the map on the styrian part. 
https://fahrplan.oebb.at/webapp/?date=05.02.2023&time=21:24:00&&input=Hohenbrugg%2FRaab%20Bahnhst&start=1#!P|SQ!histId|2!histKey|H509680