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The lower 48 states (does not include Alaska, Hawaii, or the territories) of the US are 2,670 miles (4300km) across east-to-west, and is slightly larger than all of Australia.
The distance between Los Angeles California and New York City by airplane is 2,451 miles (3944km) in a straight line, the quickest distance by road is 2,790 miles (4490km).
The distance from Miami Florida to New York City is 1,277 miles (2055km).
Austin, Texas to New Orleans, Louisiana is 512 miles (824km)
San Diego, California to Seattle, Washington is 1,255 miles (2020km)
El Paso, TX to Dallas, TX is 635 miles (1022km) [same state]
Flagstaff, AZ to Phoenix AZ is 145 miles (233km), then Phoenix to Tucson AZ is 114 miles (184km) [same state]
Distance from Colorado City Arizona to Nogales Arizona is 548 miles (882km), 396 miles (638km) in a straight line. [same state]
Distance from Los Angeles, CA to San Francisco, CA is 388 miles (624 km) [same state]
The amount of energy and resources needed to sustain a high speed rail for more than 300 miles (480km) between major cities is just not worth it yet. An ideal high speed rail would connect cities that are very close to each other, eg. within about 150 miles (240km). Which means they would work best on the east coast of the US (where cities are closer together) or in Texas (between the Fort-Worth to Dallas to Austin to Houston to San Antonio).
