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