This old guy is sitting on the end of a spur track. ( Trinity Lightweight , rotary-kiln expanded shale and clay ) This plant is located south of Boulder Colorado. This old guy was in operation about 18 years ago, but has been re-placed by a Trackmobile to move covered hoppers. Here is a link to location.
https://www.google.com/maps/@3...7,224m/data=!3m1!1e3
I could not find a builders plate on the locomotive. Is this a Fairbanks Morse Diesel ?
Steve