Certainly the CF and CG classes. I cannot deny having seen a picture of the 611 with a doghouse scabbed onto her tender. She certainly saw some freight service. On my railroad the 611 sees nothing but varnish. As for the 1218 and 2156, they would have been right at home with either of these Cabooses.
In the 3 rail world, scale N&W Cabooses are few and far between....