total: 240,000 km mainline routes (nongovernment owned), standard gauge (1.435 m) (1989)
See also Transportation in the United States.
... with 18.5% under the age of 18, 4.4% from 18 to 24, 20.6% from 25 to 44, 26.3% from 45 to 64, and 30.2% who are 65 years of age or older. The median age is 49 years. For ...