The Gerald Skillman Collection is comprised of 4 unused train sheets (Dispatchers Record of Train Movement sheets) from the Spokane, Portland and Seattle Railway, Oregon Trunk Railway, and Oregon Electric Railway.
The Gerold Dennis Collection consists of a 1956 Northern Pacific Railroad Company letter to the Great Northern Railway Company (U.S.) on the subject of reimbursement for room expenses incurred during a meeting with Canadian railroad companies.
The Gladys Bouthillier Collection consists of 2 scrapbooks including photographs of train crews staying at the Portland, Oregon Travelodge motel, taken between 1978 and 1982.
The Glen Comstock is comprised of photographs of railroad freight cars manufactured by the Pacific Car and Foundry Company, Pacific Car and Foundry Company brochures and project lists, and a 1920 letter and envelope from Pacific Car and Foundry Company.
The Glenn Staehli Collection is is self-published book of railroad stories told to Alice Staehli by her husband Glenn Staehli, who was a locomotive engineer and Road Foreman of Engines of the Northern Pacific Railroad Company.
The Gordon Hovde Collection is comprised of 67 looseleaf notebooks containing information about railroads, mostly Great Northern Railway and including the Chicago, Burlington & Quincy Railroad, Burlington Northern Railroad, Montana Rail Link and Northern Pacific Railroad.
The Gordon Jackins Collection is comprised of railroad industry and railroad hobbyist magazines, and newspaper clippings and official documents relating to Sound Transit in the Seattle, Washington area, most between 1987 and 2006.