"That's one of the great things about modelling, every build is an entry point to railway history. " ... and that's my thinking, too
There's so much to learn about how things were done from a simple open wagon. Even things like standardised nuts and bolts that we now take for granted took a while to evolve.
This is one loco I've always wanted to model. My father took a photo of No. 784 at Barry in 1948.
https://www.rmweb.co.uk/community/index.php?/topic/108032-rtr-0-6-0-chassis-selection/&tab=comments#comment-2194972