More details are emerging about the variations in the new batch of B wagons imported from South Africa to Wales earlier this year.
The specific area of concern is the vacuum reservoirs.
Himself tracked them down to Dinas during a week volunteering on the FR and it appears some of the six evidently had new tanks fitted when they were refurbished.
Not only have they changed position, to the same side as the brake cylinder, but there also appear to be a number of different designs of tank, as you can see below.
As Himself says, there's never a dull moment modelling the Ffestiniog & Welsh Highland.