Steam Coaches and Inspection Engines?

Here's a Bresler Steam coach:

Rusty

The New Haven Besler is reported by Keilty to be the last steam coach tried on U.S.

railroads, about 1936, and was not successful.  The New Haven had a fleet of Sykes

gas rail buses, and later, similar Brill ones.  However, these are all covered in the Keilty books, while the inspection engines and that one (or more?) odd duck with a horizontal boiler and usual steam loco out the front extending from a passenger coach are not, nor should they be, not being gas electrics nor some other form of "doodlebug".... well the last is maybe borderline, and could be interpreted as the "first

railcar".  This last is that of which I'd like to see more or better pictures

Alco was big into steam coaches.

Well, according to Keilty's "Interurbans Without Wires", both Baldwin and Alco had

only very few entries in the steam coach market.  I'd still like to build a Baldwin one, though, as well as the critter seen at Shelburne.  I could do it using a Walther's passenger car kit (as well as probably some cars such as the K-Line Heavyweights)...my obstable has been getting right trucks with right wheels.  The three rail market hasn't presented much in rail cars...we have all watched the G-scale Mack railbus run back and forth in the Orange Hall, but...nary a one in O3R, a presumbably much larger market.

I was searching Wikipedia, under Mason-Bogie, and then found a LOT of photos that

could be pulled up for those, including one not a Mason Bogie, but what looks like

a large scale outdoor model (identified as in New Jersey) of an inspection engine

lettered for the Denver and Rio Grande and also named "Columbus".  The trackwork

and figures in the loco are very realistic.  Hard to tell it was a model.   It was a 19th

century loco, but I have never before seen a Rio Grande inspection engine and wonder if the prototype existed?  A LOT of brass models of Mason Bogies are shown, too....many HO, didn't see any O scale ones in a quick skim....Mason made standard gauge ones such as the Hecla and Torch Lake one identified as now at Greenfield Village.   Kitbashing one in three rail does not look difficult, except getting the

drivers and cylinder assy. to turn as a truck.  For sure neither that nor an inspection

engine or the critter I want, which is very similar, with more coach space, as that

D&RGW model found with Wikipedia on the net, have been done commercially in three rail!  Now the creative people on here.....may have cranked some out..