I’ve only ever caught/seen 16 twice since May (23/7 and 2/8), so I think it’s out.
Haven’t caught 54, seen it 28/8, 12/9 and 18/9.
72 was with 20 in Mayne for maintenance from 17/8- around the 20th or so? Last I saw it was on 20/9 doing a special where it was held up for some reason abut 500m heading outbound from eagle junction. I don’t know what it was doing on the special run, speculate perhaps going to a depot of some sort for storage?