@Peter C,
The Queensland Railways DH Class, has buffers right up to withdrawl from offical service, the majority of the class had D4 drawhooks couplers, but the final 4 were delivered with transitional knuckle couplers but one member of the class was fitted with Auto Couplers in its twilight years in the 1990s to be acted as the Mayne Yard Shunter.
{Just Thinking from the top of my head, so I may or not be correct}
I can email you my notes on the class, aswell as diagrams and photograghs from my railway groups archives aswell from online sources.
Re: Content
Dw, I have had my fair share on moaners and windgers about my stuff over the years but I learnt to ignore it and just make even better content. Gimme Pigs are even dangerous creatures according the old dusty Auran Fourm survial guide, just come prepared when they smell "
freshly baked content"
Kindest Regards
Michael Gitsham
QHR Commissioner Of Railways