I had ordered the 1960s version and, straight out of the box, they look great. However, it was time to consider weathering. Photos that I have consulted seem to indicate a wide range of weathering options but most seem to show an underlying rust hue. I sought to represent this with a light coat of Humbrol Rust Wash. This was followed with a black soot colour sprayed downwards concentrating on the upper part of each wagon. I may have overdone this a bit. Each wagon was then sprayed with a matt finish.
To finish, I added some additional rust on the chassis and substructure using pastels together with a dilute greasy black wash on and around each dome. Even though it has a gloss finish, much of the grease sheen has been lost in the overall black of the upper part of each tank. The effect doesn't come through on any of the photos I took and is only just visible when looking carefully. While I could add some extra wash around the domes, I think I will leave it for a while until I can get trains rolling again to see how they appear as part of a larger consist.
As 2013 draws to a close, I would like to thank those who have offered comments and advice throughout the year, and to take this opportunity wish all those who read this post, as well as your "near and dear ones", a very Merry Christmas and a Happy New Year for 2014.