The Western Pacific Railroad built the Feather River Route across the Sierra Nevada in 1909 to complete a San Francisco to Salt Lake City route which competed with the Southern Pacific Railroad route over Donner Pass. While significantly longer, the Feather River route was chosen by the Western Pacific because its high point, the Chilcoot Tunnel under Beckwourth Pass, is at an elevation of only 5,000 feet as opposed to 7,000 feet over Donner Pass. Most of the route follows a gentle grade along the Feather River.

The Clio trestle is 172 feet high and 1,005 feet long.

Both the old Western Pacific route and the old Southern Pacific route are now owned by the Union Pacific,

Source: Wikipedia