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  1. Rail transportation in the United States - Wikipedia

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

  3. Map of Railways in USA [United States Railway Map]

  4. Railroads | US Department of Transportation

  5. List of common carrier freight railroads in the United States

  6. Freight Rail Overview | FRA - Federal Railroad Administration

  7. A History Of Railroads: The Industry Through The Years - American-Rails.com

  8. How the U.S. Rail System Works | Council on Foreign Relations

  9. Rail Transportation | Bureau of Transportation Statistics

  10. Railroads In the U.S. - Vivid Maps