Brian, a number of that type of turntable are still in use here, one installed in the past few years near here to support the operations of the Feilding Steam.[
www.steamrail.org.nz]
The design you see isn't actually a Sellers even though NZR did import and use them but later made their own castings as well, the main differences being the lack of strengthening rings around the circles and centre casting design.(and yes, I have been fooled by that in the past)
A true Sellers in Aussie [
flic.kr]
A close up of the Kingston TT [
flic.kr]
Note if you will the Ab778 (along with 663 and 608 still in steam here) all have the true Ab Vanderbilt tender with the short bunker and single central filler compare these pictures with Charlie's OP picture and my 2nd post shots of Woodville's Ab 751 which have/had the G class tender. Whether these were new built to the G design or from the 1956 scrapped G class I don't know. The bunker is way larger, twin water fillers on the sides and all welded construction to boot.
....by the way: The 1937 G class were 6 Pacifics built out of the Garratt 1928 G class 4-6-2+2-6-4 failures. [
www.trainweb.org]
Kingston Flyer, an Ab 795 class, steam locomotive, [195-?]
Reference Number: PAColl-5935-01
The Kingston Flyer, an Ab 795 class, steam locomotive, taken ca 1950s by an unidentified photographer.
[
mp.natlib.govt.nz]
Ab class steam locomotive (New Zealand Railways, number 658, 4-6-2), between 1916-1949
Reference Number: APG-0210-1/2-G
Ab class steam locomotive 658, type 4-6-2, built by NZR Addington. Location unknown. Photograph taken by Albert Percy Godber between 1916 and 1949.
[
mp.natlib.govt.nz]