total: 240,000 km mainline routes (nongovernment owned), standard gauge (1.435 m) (1989)
See also Transportation in the United States.
... Ose Pande syndrome[?] Aarskog syndrome[?] Aase Smith syndrome[?] Aase syndrome[?] ABCD syndrome[?] Abdallat Davis Farrage syndrome[?] Abdominal aortic ...