While searching my Jackson and Kindig Slides on an unrelated matter last Sunday Morning, I did a little survey to see which locomotives were actually photographed with the infamous Green Jacketing. I was able to ascertain a green jacket on the 340, 346 and 453. There were probably more, but I saw none on the bigger "K's" (28 and up). Oh yes, the sheet metal jacketing on the Air Pumps was also green.
This not to say that the larger K's weren't painted that way at one time, just that I didn't see them painted that way in the slides that I have.
No conclusions, just thought you'd like to know.
Rick Steele