The Vance Colyar Collection consists of locomotive diagrams and photographs of railroad equipment with emphasis on locomotives.

The Tom Radoman Collection is comprised of 7 photographs taken between circa 1930 and circa 1975, mostly on Nothern Pacific subjects.

The Stephen Irwin collection is 152 railroad 5" x7" photographs each printed and captioned by photographer Ron Nixon from his collection of Northern Pacific railroad photographs.

The Skykomish Historical Society Collection consists of the Northern Pacific's booklet "Through Wonderland" on Yellowstone National Park, a collection of photographs accumulated by Chuck Strawn, Great Northern Railway locomotive erection drawings gathered by Mike Bartenstein.

The Robert Grove Collection consists of 6 glass plate negatives and 9 prints taken from 2 of the negatives. 4 negatives are scenes woodland scenes near Mount Rainier, 1 is of a railroad tunnel of the Northern Pacific Railroad Company, and 1 is an unidentified town with Mt. Rainier in the background.

The Richard Batie Collection consists of documents, photographs, and printed ephemera.

Still images of railroad equipment, facilities, employees, customers and other railroad-related subjects whether printed photographs, negatives, slides or digital.

The James Fredrickson Collection Spokane, Portland, and Seattle Railway photograph subseries consists of 2 photographs of Spokane, Portland, and Seattle Railway stations shared with the Northern Pacific Railroad Company.

Still images of railroad equipment, facilities, employees, customers and other railroad-related subjects whether printed photographs, negatives, slides or digital.

The Northern Pacific Railroad photographs portion of the Walter W. Ainsworth Collection includes photographs pertaining to equipment and locations in the Pacific Northwest.