Album containing black and white photographs, primarily of Coalinga, California. Other locations include Yosemite Valley and Santa Cruz, California. Subjects include an oil fire at Clendenon Company, and personnel and trains of the Southern Pacific Railroad.

Collection consists of materials that belonged to Arnold P. Hansen, a special agent at Union Station in Portland, Oregon. Materials include a photo album of suspects apprehended for crimes committed against or in relation to the Union Pacific Railroad, as well as a photocopy of a signed confession by Roy DeAutremont to the robbery of a Southern Pacific train near Jackson County, Oregon, in 1923.