These are BLCA and BLCB wagons built by the Golden Rock Worshops. (Note - when the wagons were introduced they were variously referred to as "BLLA" and "BLLB" as well.)
Casnub Bogie. By Cwm/goc.
BLCB Wagon.
Coupler.
Another view.
Closer view.
End view.
Bogie view.
Distant view.
Wagon ready.
Top view.
Container lock arrangement.
Dark view!
End view of BLCA wagon with the CBC coupler.
Air brake piping.