The Kenneth Thompson Collection includes Great Northern seniority lists from 1956 and 1960, the Empire Builder schedule for 1960, and condensed Great Northern passenger schedules for 1962 and 1964.
The Kent Sullivan Collection consists of 1 poster from the Northern Pacific Railroad Company and one video tape of the television show "Exploration Northwest" entitled "Logging and Railroad History", Volume 209, produced in 1978.
The Kermit Hedman Collection is comprised of public timetable, 14 employee timetables (duplicates), a timetable for the St Paul and Pacific Railroad dated 1866, diner menus, a United States map issued by the Great Northern Railway, rules, fares, brake equipment books, and two Official List of Officers, Agents and Stations books dated 1952 and 1959.
The King Agriculture Museum Collection consists of a photo of Puget Sound Flouring Mill workers in front of the mill and the Stadium Telegraph Office. Boland Photo E1388-Tacoma-180 degree photograph.
The Kristi and Tom Hamre Collection consists of color photographs of Pacific Northwest railroad subjects taken in the 1990's and 2000's by the Hamre's.
The Kurt Armbruster Collectionis is comprised of photographs, books,audio cassettes of conversations with railroad employees and CDs on Pacific Northwest railroad subjects.