Glad to help!

actually, I didnt figure out the lettering in the photo..
all I could make out what was people had already said, possum (something) and oil (something)..
couldnt make it out clearly from the photo..
I dont remember which search combination ended up finally doing the job,
but I searched on several variations of the words possum, oil, railroad, shay, bachmann and On30.
eventually I hit on something, and it all fell into place..
just takes a bit of trial and error!
The links say that Bruce does model in Large Scale (Fn3) but IMO its pretty clear
the original photo is of an On30 shay..the couplers give it away.
(edit/update)
actually..I just went back through my browser history to find it!

Here are a bunch of google searches I tried, that didn't work!
possum and oil railroad On30
possum and oil railroad HO shay
"possum grove" railroad HO shay
"possum grove" railroad
possum railroad "oil vaccum"
possum railroad shay
After each one of those, I poked around a bit on the results..but didnt find our guy, or the shay...Nothing was working..I thought "if this guy has a photo on-line, the name of his railroad must be out there!"..what else to try..another combination of terms,
this time! a hit! found it!

here is the final combination of google search terms that solved it:
possum "& oil" railroad shay
(copy and paste that line into google to see what it found)
It was the "& oil" that did it..because with the quotes, google treats it as one term..
so thats really four search terms:
(possum) (& oil) (railroad) (shay)
Those four things together is what finally clinched it..with the "& oil" being the most important.
Scot