Re: Vauclain compound *LINK*

Are you referring to 1385? If so, it was built by ALCO in 1907. Vauclain compounds were exclusively a Baldwin invention, and only offered on Baldwin locomotives. I think 1385 has inside valves.
There may be others that were originally built as a Vauclain compound, but converted later to simple engines. While Vauclain compounds were more fuel efficient; it was difficult to get the high and low pressure cylinders to exert the same force; so they wore out crossheads fairly frequently. The use of superheat also replaced compounding in general (with the exception of Mallets) after 1900.
-James Hefner
Hebrews 10:20a