The famous Feather River Route was constructed between 1906 and 1909, connecting the cities of Oakland, California, and Salt Lake City, Utah. The Western Pacific RR was bought in 1983 by the Union Pacific.
This pic from the PTA Transit Authority blog (a companion blog to Viewliner) shows a westbound EMD FT diesel, No. 906-A, crossing the North Fork of the Feather River, another 45 miles (73 km) of canyon to go.
|Postcard pic in the Feather River Canyon with the California Zephyr train|
The map below shows the Western Pacific system in 1930 - the Feather River is in California, near Nevada..