As pointed out in that story with the mention of the Wyong, some passengers can't even tell the difference between a single & double deck train.
I feel compelled to point out that the vast majority of CityRail's patronage base is neither aware of nor particularly interested in what type of train is used to operate their service. Certainly, we
are aware that the Bathurst service is operated by a 2N set, a single-deck diesel train with fluted body-sides and square lavatories; we are equally aware that the Wyong service would be operated by an 8H set, a double-deck electric train with smooth body-sides and round lavatories.
Most passengers do not know and do not care about these differences; as such, the type of train used for a service is (not unreasonably) immaterial to them and thus does not serve as an indicator for the average passenger as to what service to board for their trip. While we can certainly assert that more often than not passengers do not read and do not listen, as well as admit that errors in communication were made, I do not for a moment believe that it is justifiable to ridicule passengers based on their inability to differentiate the 17:55 Bathurst service and the 18:00 Wyong service based on whether the trains were single-deck or double-deck.