NOTES: Rail transit is the sum of commuter rail, heavy rail, and light rail. In several large urban areas, Amtrak and commuter rail stations are shared. Starting in 2001, stations serving the Alaska Railroad are included in the rail transit total. Rail transit data for 2002 and later years include service both directly operated and purchased. Prior to 2002, data only include directly operated service.
SOURCES: Rail Transit: Federal Transit Administration, Passenger Rail: National Railroad Passenger Corporation (Amtrak) as cited in U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, National Transportation Statistics, table 1-7, available at http://www.bts.gov/publications/national_transportation_statistics/ as of August 2008.