KEY: R = revised.
NOTE: Rail transit is sum of commuter rail, heavy rail, and light rail. In several large urban areas, Amtrak and commuter rail stations are shared.
Amtrak, Amtrak Annual Report, Statistical Appendix (Washington, DC: Annual issues).
U.S. Department of Transportation, Federal Transit Administration, National Transit Database (Washington, DC: Annual issues), table 20 (for 2000 issue) and similar tables in earlier editions.