Phase II of the Expo Line will eventually connect the existing Expo Line, which runs from Downtown L.A. to Downtown Culver City, all the way to Santa Monica. Construction of the line is already underway.
Faced with conflicting opinions, it's natural for the Supreme Court to want to have the final say in this case and establish case law for similar legal conflicts in the future. If the Supreme Court rules in favor of NFSR, it could require the traffic study for the entire Expo Phase II to be done over.
After a string of legal defeats, NFSR has two wins in recent months. Last month, the California Public Utilities Commission announced they will take a second look at some of the controversial crossings in Phase II.
No timeline has been announced for the appeal. At this point, the Supreme Court is not requiring that Expo halt construction on Phase II.
Brightline West will be a 218-mile 186-mile-per-hour rail line from Vegas to Rancho Cucamonga - about 40 miles east of downtown L.A. - expected to open in 2028