Didn't know that Blaine - I only photographed the things.
Right to the end, the Hunslets had only one lamp iron - on the second man's side (left if looking at the locomotive, right if sitting in the cab). I last photographed a push-pull set south of Dundalk on 19 July 1982 101 leaving Drogheda | With arrival of the two 111 class loc… | Flickr but they probably worked south after that. The coming of 113 in August 1984 likely saw the end of push-pull working on the cross-border links, but if anybody knows different, I'll be glad to hear from you.
Last photographed top & tail push-pull on 17 December 1988 102 & 101 Lisburn | A poor shot on a bad day, but this is be… | Flickr but that only got to Newry. Again, I'll be glad to know of any later workings.
When it comes to lamp irons, the DTSOs are a different matter. I seldom photographed the a&s* end of a train (no imagination when it comes to photography), but this shot suggests there was a lamp iron on the left (looking at the unit) above the light and another just below the cab window. Those positions did not change during the service life of the DTSOs 101 Bangor | 101 "Eagle" propells the 15.00 Bangor - Portado… | Flickr as far as I can tell.
My last photograph of a pair of Hunslets on a Dublin was 24 June 1989: 103 & 102 leaving Lisburn | To have had one 101 working by J… | Flickr - a when 101 also worked the sprayer and there must have been several blue moons in the sky. No issue with the lamp irons as 102 & 103 would have run-round in Connolly.
If anybody can fill-in the gaps in my knowledge, it will be appreciated.