To finish things off, some Black Smoke has been added to the wheel centres and the tender axleboxes and springs. I have also applied some Dark Mud to the seams in the tender, to indicate the start of rust, and some Rubbel Dust to the horizontal surfaces of some of the steps.

The requirement was for a very grubby workhorse, which might suggest that piles of paint and pigments are to be applied, but it is just as effective to apply small amounts of both to achieve the effect, adding more if really necessary at any stage. The principle of only using small quantities at any time to achieve dirty effects is illustrated in many of the images in my flickr photostream:

https://www.flickr.com/photos/laughinglobster/

That's it for now. I expect there will be more after the Great Electric Train Show at Stadium MK. . . . . . . . . . . . . .