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 Scott Tanner Collection includes Great Northern and Northern Pacific documents from the early to mid-1900's , drawings and documents relating to the King Street Station in Seattle, Washington, a scrapbook with items from Holloway, Minnesota and an engineering drawing of the trestle at Lowell, Washington.
The San Luis Obispo Railroad Museum Collection is comprised of the book "Wonderland 1905", descriptions of the Pacific Northwest written by Olin D. Wheeler and published by the Northern Pacific Railroad, and the brochure "Scenic Highlights" produced by the Northern Pacific Railroad.
The Russell Johnson collection includes 38 equipment manuals, textbooks and rule books, 12 magazines and newspapers, 18 time tables, track maps, employment documents and miscellaneous small artifacts and printed ephemera related to the Northern Pacific Railroad Company, Great Northern Railway Company (U.S.), and Burlington Northern Railroad Company in addition to operating manuals for locomotives and other railroad equipment. The second accrual was 2 boxes of engineering drawing and miscellaneous documents from the Northern Pacific Railroad Company's Bellingham, Washington depot.
The Russell Holter Collection includes Milwaukee Road research materials accumulated by Ruth Eckes, news paper clippings on Milwaukee Road subjects gathered by R. L. Baird, photographs of northwest railroad subjects from the Michael W. Dean collection, equipment manuals and other research materials on the Milwaukee Road and other northwest railroads, and organizational files from the Cascade Rail Foundation and Friends of the Cle Elum Depot.