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  1. Rail transportation in the United States - Wikipedia

  2. History of rail transportation in the United States - Wikipedia

  3. Railroad | History, Invention, & Facts | Britannica

  4. Railroad - History, Development, Impact | Britannica

  5. The History of Railroads: From Trackways to Hyperloop Trains

  6. Railroads | US Department of Transportation

  7. Transcontinental Railroad - Construction, Competition & Impact - HISTORY

  8. Railroad - Track, Locomotives, History | Britannica

  9. Railroad History In The USA - American-Rails.com

  10. Railroads In America, U.S. History - American-Rails.com