Vienna S-Bahn is a HUUUGE network and it presents as a great option. It would be an instant buy from me. You could especially focus on the inner/near-city lines like S1 (S-Bahn Wien Stammstrecke), S45, S7 to airport S50 to St. Polten
dude, I have already done a lot of suggestions on stuff around Vienna, just look it up, and it is decently detailed
And they can add some of the s bahn trains like ÖBB 4746 desiro (idk why they didnt add that in the semmeringbahn route), 8633 cityjet and wiesel doppelstockwagen and maybe railjets and nightjets with lost of timetables with all the trains