I've always liked the look of tinted windows on contemporary prototype diesels and I believe, if I'm not mistaken, that Overland Models is the only manufacturer to add the tint to appropriate models. I wanted to see how Lionel's ACe would look with tinted windows and with 2 rail wheelsets added. I used Tamiya PS-31 smoke spray tint on a piece of clear styrene that is temporarily taped to the cab windows. To get the desired color, I used three coats of spray. The wheelsets are non-geared 42", .145" thread width and look pretty good since they're closer in scale to the 43" wheel that the prototype uses. I'm also going to try adhesive window film to see how that looks when I convert a few Lionel ES44 loco's to 2 rail.
Overall, I'm pleased with what I see, although I still have more work to do to it. In the last pic, posed next to an Overland 70mac that I used as a reference to get the desired color or shade of tint.