“High-speed rail (HSR) in the US is currently dominated by Amtrak's Acela (150–160 mph) in the Northeast Corridor, with major projects underway to bring 200+ mph service to the West, including Brightline West (Las Vegas–LA, 2028) and California High-Speed Rail. These initiatives aim to connect city pairs in under 3 hours, offering alternatives to regional flights”
https://en.wikipedia.org/wiki/High-speed_rail_in_the_United_States