In the background, behind my exploits with the High Level Pug, I've been building an Alan Gibson kit of a J15, or more accurately a Great Eastern Y14, as it will be in condition suitable for circa 1908.
I'm now at the detailing stage of the body, and I've found on the fret these mystery parts - four times part #42 :
They look like washout covers for the boiler. However there is no mention of a part #42 anywhere in the instructions, nor do they show on the exploded diagram, which is intended to cover the parts not mentioned in the text.
Fortunately, it seems like they were a not an original GER feature, so I can safely ignore them. I can't see them evident on any of the period photos that I have from the GERS Journal. But does anyone know if my assumptions are correct?