Hi Dave - well done on this threat, very inspiring.
Couple of questions. Please could you give more detail on how you painted the ballast. I have a largish layout that needs ballasting and cost is one of the things that is putting me off. yours looks very good. Also you mention sand came from the pet shop, does it have any special name?
Also how old do you think your class 25 is? I have one which I suspect is late '70's vintage and despite tinkering with and spair parts is a very poor runner. Did they improve over the years. I would not recommend mine for a beginners layout, I think the poor running would spoil the layout for a beginner!
Carn't wait to see finished layout.
Many Thanks
Paul