XPressWest, which is now owned by Richard Branson's Brightline/Virgin Rail, has received right-of-way to build along I-15 and entered a lease agreement with Caltrans.

https://scvnews.com/caltrans-enters-lease-agreement-with-xpresswest-for-high-speed-rail-between-socal-vegas/

An environmental study estimates the completed project will reduce carbon emissions by 300,000 metric tons a year – the equivalent of removing nearly 65,000 vehicles off the road. Additionally, XpressWest expects to create more than 10,000 jobs during the project’s construction with another 500 new jobs post-construction.