Oh, I didn't even think to look at epidendrums! I saw the sheath and immediately thought cattleya.
I think it looks close to the Epi. syringothyrsus.
Also, I found this link to a book that is available to download called "Orchids of Peru":
Internet Archive: Free Download: Orchids of Peru
One of the first sketches in the book has one of Epidendrum ampliracemum that looks similar, too.
Ooooh, this is great fun trying to find this one!!

-ken