Historical Reference sites
- Great Northern Railway Historical Society
- Great Northern Railway (by Lindsay Korst)
- Great Northern Railway - Empire Builder
- Analysis of Twin Cities-Pacific Northwest Rail Passenger service World War II to creation of Amtrak
- James J. Hill documentary in the making
- Museum of Railway Timetables All the Amtrak timetables ever issued!
- Unofficial Amtrak equipment roster
- Biography of James J. Hill (the Empire Builder) Biography of James J. Hill, the original Empire Builder