Great Northern Railway Authorization for Expenditure (AFE) 18691, Olson, British Columbia, 1921. Relocate 22 X 24 Section House, 16 X 24 Laborers House, 8 X 12 Tool House, and Two 4 X 6 Privies From Olsen to Flagstone. Interstate Commerce Commission Account Number 17 Roadway buildings. Series II. Lines West. Other Subject Categories: Roadway Buildings, Section Facilities

AFE 22010, Olson, British Columbia, 1913. Place Derail on South End of Passing Track. Interstate Commerce Commission Account Number 9, Rails. Series I. Lines West. Other Subject Categories: Track, Industry

AFE 25135, Olson, British Columbia, 1914. Construct 2 1/2 Miles East. Interstate Commerce Commission Account Number 14, Crossings. Cost: $0. Series I. Lines West. Kalispell Division. Other Subject Categories: Crossings, Private