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Idaho Railroads: State Map, History, Abandoned Lines - American-Rails.com
Old Historical City, County and State Maps of Idaho - MapGeeks
Idaho - Abandoned Rails
Idaho Railroad Visual History - Digital Library of Idaho (DLoI)
Railroad Maps, 1828-1900 - Library of Congress
Idaho/Railroads - OpenStreetMap Wiki
Camas Prairie Railroad: An NP/UP Property - American-Rails.com
List of Idaho railroads - Wikipedia
Railroad Map Depot - Surface Transportation Board
Historic Map - Idaho - Railroad Map - 1896 - World Maps Online