The Denver & Rio Grande Railroad No. 668 is a class 120 2-8-0 "Consolidation" type locomotives were built in 1892 by the Baldwin Locomotive Works for the Rio Grande Western railroad as #149.
It was built for passenger and freight service on the Rio Grande Western railroad until transfer to the Denver & Rio Grande Railroad and renumbered to #668 in 1908.
In December 1916 the locomotives served, and transfer the Indian Valley Railroad and renumbered as #2 until the railroad ceased operations and was scrapped in December 1939 when the locomotive retired.