Great Northern Right of Way and Track Map, Cascade Summit, Washington, 1897
Great Northern Blueprint Number 1321-20-2, map of Cascade Summit, 1897. Other subject categories: Right of Way and Track Map
Great Northern Right of Way and Track Map, Cascade Summit, Washington, 1893
Great Northern Blueprint Number 1321-20-1, map of Cascade Summit, 1893. Other subject categories: Right of Way and Track Map
Great Northern Authorization for Expediture (AFE) 4330, Cascade Summit, Washington, 1901
AFE, Series I, Number 4330, Cascade Summit, Washington, March 15, 1905, Take Up Switchback Rail. Located in folder 'Cascade Tunnel'. Other subject categories: Relay. Initial cataloger's disposition code: X, AFE itself not found but referenced in other documents