I've seen hundreds of GPO and P&T ones. The real rarity is a red coloured one for lines carrying electricity, saw one once ever at an IR railway station, still in place and unbroken but no longer carrying any wires.
The South Wexford booking offices as far as I know were identical or near identical, being all constructed for the Fishguard & Rosslare Railways & Harbours.
The DWWR had variations on the arc roofed shed theme, probably in different sizes for various classes of station or halt. At least one cabin (Gorey) carried a contractors sign saying it was built by Thompsons of Carlow. These would have been subbed out to specialist contractors like Thompsons rather than built by the railways themselves.
This x 1000.
There are models that do not interest me personally but I dont go out of my way to dump all over them. If someone is able to produce and sell them whether it's a 22k or a J15 fair play to them. If you dont like them dont buy them. Others will be glad to have them on their layouts.
All North British Loco of Glasgow products.
Scarva, class QG of 1903, passed to CIE, scrapped 1962.
Mars, class QL of 1907, scrapped 1957.
Culloville, class LQG of 1906, passed to UTA, scrapped 1958.
It's lined "photographic grey", they were intended to be GNRI green but green appears black or nearly black in b and w photos and doesnt show detail very well so they were painted grey for their works photos.
Amazingly sharp photos too for the time. You can zoom in and read the signal cabin clockmaker's names on the dials in some of them.
Some nice photos of staff at rest and work too. I find the standard 3/4 front view of locos and trains without any humans in sight to be rather boring and lifeless. You could be forgiven for thinking that trains ran themselves without any human intervention in some photo collections.