There is an original GSWR hopper at Downpatrick, in the same original condition in which it was withdrawn from traffic by CIE in the 1980s.
Thee is also a plough van there - again, original GSWR state more or less, and same as 8456 would originally have been.
If you're modelling either, the plough van is completely wrong livery wise. In GSWR days they were black all over, with white lettering as on the DCDR plough van. In late GSWR, GSR and CIE days up to about 1970 they were slate grey all over. Neither ever had a black chassis, except when all-black.
From 1970 all over standard CIE brown, not the shade on the plough van.
The hopper remains in untouched, but by now extremely faded and weathered CIE brown.