By the merest hint of good fortune I have discovered a list of the ex GNRI locomotives that the UTA decided to scrap in 1958 and I can positively identify three out of the five numbers given and possible explanations for the anomalies.
No 21 T2 class 4-4-2T built by Nasmyth Wilson in 8/24, not renumbered in UTA list, wdn 8/59 which I think is the date of selling for scrap.
No 108 LQG class 0-6-0 "Pomeroy" builty by Dundalk works 4/08, rebuilt 6/28, not renumbered in UTA list, wdn 12/59.
No 157 QL class 4-4-0 "Orpheus" built by NBL Glasgow 11/04, rebuilt x/19 and 9/22, not renumbered in UTA list, wdn 12/59.
I am reasonably happy that the three above are in the line up in Tim's photo.
The less certains,
No 40 SG3 class 0-6-0, built by Beyer Peacock 2/21, originally number 201 and renumbered in 1/48 to make way for the first of the second batch of U Class 4-4-0s "Meath". Subsequently further renumberd in May 1959 as 34 in the UTA capital stock list but not withdrawn until 5/65. Whilst Tim probably/possibly listed it in his photo, it may well have just been resting between duties and certainly wasn't scrapped for some years.
No 163 LQG class 0-6-0 "Banbridge" built by NBL Glasgow 4/08, rebuilt 9/27. It went to the CIE in 1/48 and was wdn 11/62 so pretty unlikely to have been in the scrap road at Adelaide on the last day of October 1958. Is it possible that Tim wrote this down incorrectly and it is in fact 162 "Ballyroney" of the same class that went to the UTA and was in the scrap list of 1958 not having been renumbered by UTA, formally being withdrawn in 12/59. Seems the most likely explanation.
Regards
Martin