Well well, a very interesting project indeed. This may be the inspiration I need to get 66170 finished. I look forward to seeing the work when it begins!
66177 had both cab roofs painted white, the one at the exhaust end just tends to get covered in clag You can just make it out in the picture
Another loco (the one that was at Toton for years as a spares donor) now has a fresh maroon roof one end where the white test application has been painted over.
Anyway, back to the mundane and 66030