I did a search at MTH and found 3 Railking N&W bay-window cabooses (cabeese?). Two of them were eliminated as not even close to the color of your model. For the third, I could not find a clear picture, but it looks like it might be part of Set #30-4058-1. If so, it is part #30-129g. Maybe somebody with that set can look at the caboose and see if it's car number matches yours.
Chuck