I've touched up the blue on the steel parts, given the wood a good cleaning and oiling, and spent quite some time removing gunk and rust from the lithographs tin base.
I used commercially available cold blue solution to blue the steel, and it did not achieve the same greenish blue as the remainder by the appearance is much better. [ Guests cannot view attachments ]
The engine base, while dirty, have every bit of the original smoke effect paint. Quite fetching. [ Guests cannot view attachments ]