At least for its Las Vegas segment, it may qualify. According to https://en.wikipedia.org/wiki/High-speed_rail https://en.wikipedia.org/wiki/High-speed_rail :

At least for its Las Vegas segment, it may qualify. According to https://en.wikipedia.org/wiki/High-speed_rail https://en.wikipedia.org/wiki/High-speed_rail : While there is no single standard that applies worldwide, lines built to handle speeds above 250 km/h (155 mph) or upgraded lines in excess of 200 km/h (124 mph) are widely considered to be high-speed. From https://www.hsrail.org/brightline-west/ https://www.hsrail.org/brightline-west/ : Brightline West is ready to connect Las Vegas and the Los Angeles area at speeds of up to 180 mph.