A very good reference source for the NSW standard Goods classes are Ron Prestons Standards in steam series. One volume covers the T ( D50), another the TF/K classes ( D53/D55) ( the other volumes cover the S (C30/C30T) and P( C32) classes).
While Not exhaustive, and very much centered on the usage of these of these machines, there is enough technical & photographic information to get a reasonably accurate representation of these machines - as has been pointed out, the variations are endless: with the T class, major variations include two different types of smokebox for the superheated versions ( the last batches, built by North British, had the chimney 12 inches further back than the later superheated rebuilds), the use of laird or alligator cross heads, some were fitted in their later years with front auto couplers, virtually all superheats were fitted with electric light, and most saturates, with the exception of 5112, without - another giveaway as to saturate/superheat is the absence of tailrods on superheats - the exception being the two unique Super B's
the TF and K classes had fewer variations, but even there variations existed. Designed as superheats from the start, wartime conditions dictated a number of TF's were built as saturates, a breed that vanished with the locomotive culls of the depression, Built initially with coned boilers, as in Pete's model, they were progressively fitted with the standard parallel boiler from the 30's, initially with a drum head smoke box - by the end, all survivors had been fitted with an extended smokebox saddle.
The major variation with the K's was initially limited to the use of outside axleboxes on the final 20 or so. Again reboilered with the standard boiler by the late 40's the final variation was the fitting of oil firing of quite a number during the late 40's... these did not last long, and the K's as a class was the first to go
there were of course minor variations on all classes, the position of the boiler feed, the use of exhaust injectors for a time, variations in the smokebox door, and its seating arrangements etc etc and individual variations - saturated 5112, for example, ended up with alligator crossheads, electric light, on its last shopping, front auto couplers and a morts dock tender, 5240 ended up with a leading funnel smoke box ( with 5048 having a NB type! ) and so on
Tenders were another story - as originally built, the T & TF classes were fitted withe the standard 3650 gallon tender as modeled by Pete. Midway thru the TF program, and continuing with the K's the 'Wampu' tender was introduced, with a boxier body, and a straight sided flair at the top, these held 4000 gallons of water. A small number of the turret 3650 gallon Morts dock tender were also built in the late 20's. Finally, with many of the the older tenders rusting out, 200 5000 gallon 'commonwealth' tenders were built about 1950, which of course became the predominant tender over the final years ( half a dozen or so c35's were also paired with this tender for the last couple of years too)
Tenders were often exchanged at will, while the original 3650 gallon tender was usually paired withe saturated D50's, it was not unknown for D50's to be paired with wampu's, Morts, and ultimately commonwealth tenders; Some tenders were at various times of their lives paired with members of all three classes
As an aside, the current models available do not allow for a perfectly accurate representation of the TF/K classes in their later years - with the final reboilering of the TF's & K's occurring in the mid 40's, a couple of years prior to the introduction of the modeled commonwealth tender . The only truly prototypically accurate combination available at present would be the D53 + D50 tender in a layout set prior to the end of WW2 - No matter - the models are excellent, and I'm sure Pete has better things to do than model every possible variation of the standard goods!
