Cool find Jose!
There's a big trestle that once existed in the Black Hills called "Sheep's Canyon Trestle":
From "The Railway Age" Oct. 1899 issue.
It was built just up the hill from Edgemont, South Dakota on the CB&Q Highline. It was 700 feet long and 126ft tall. The structure was a temporary fix however, as the span was filled 9 years later.
I've got more info on a blog post about the trestle from a couple months back: Story of the Sheeps Canyon Trestle