Since one of the forum's monitors had kind comments about The Narrow Gauge and Shortline Gazette, let me refer you to the Jan/Feb. 2013 (and
Nov./Dec. 2012 issues, and their photos and articles on steam coaches. I have looked for more info on the Peruvian and "Yankee Teapot" types of these since I saw a photo of one in the station at Vermont's Shelburne Museum. (that I would like more info on)
There isn't a snowball's chance one of these will appear commercially in
three rail...or even O scale two rail brass...I don't think any were offered in HO during the 1950's/1960's brass glory days. Not even of the Baldwin steam car that just took First Place in G scale as a scratchbuild at the 2012 Narrow Gauge Convention.
But if you flip to page 7 "The Pigeon Hole" in the Jan/Feb 2013 issue, and
you have photos of these critters operating here in the U.S., I, and perhaps other, would like to see them thrown on here.