Usually when I do repaints it is a specific railroad ( and usually B&M or New Haven), but lately I've decided to try a few generic pieces.
The attached picture show my latest Lionel 33 in Hunter green, an American Flyer 4644 in gray and an American Flyer gondola in Red. I'll be back to painting specific railroads but I figure someday I'll want to sell these and this might make it easier.