Great Northern Railway Historical Society Blueprint Collection JSBP2470, Helena, Montana, 1947. Great Northern Blueprint Number 9311-1, Engine House. Floor Plan, Elevations and Section. Interstate Commerce Commission Account Number 20, Shops and Engine Houses. Other ICC account descriptions: ICC Account Number 20, Engine House.

Great Northern Railway Historical Society Blueprint Collection JSBP2471, Helena, Montana, undated. Passenger Station. Rear Elevation. Interstate Commerce Commission Account Number 16, Station and Office Buildings. Other ICC account descriptions: ICC Account Number 16, Station Facilities.

Great Northern Railway Historical Society Blueprint Collection JSBP2472, Helena, Montana, undated. Montana Central Railway Blueprint Number Design # 2, Bridge # 82. (Prickley Pear Creek) - Sketch. Interstate Commerce Commission Account Number 6, Bridges, Trestles, and Culverts. Other ICC account descriptions: ICC Account Number 6, Bridge.

Great Northern Railway Historical Society Blueprint Collection JSBP2473, Helena, Montana, undated. Great Northern Blueprint Number 103.19.01, Crossing with Np Ry. Signaling Diagram. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Interlocking.

Great Northern Blueprint Number 1201-16-9, map of Helena Number 3, undated. Other subject categories: Right of Way and Track Map

Great Northern Blueprint Number 1371-8-3, map of Helena, 1887. Other subject categories: Map

Great Northern Blueprint Number 1215-5, map of Deed from C.A. Broadwater of Street South of Montana Central Depot to City, 1888. Other subject categories: Map