California issues an RFQ (Request for Qualifications) in preparation of buying trainsets capable of travelling around 220mph (355km/h), two prototypes, a simulator, spare parts and operational availability for 30 years. Timeline for revenue operation currently is at year 2030.
E: Official release from California government: https://hsr.ca.gov/2023/08/24/news-release-california-high-speed-rail-authority-moves-closer-to-buying-first-trainsets/
exactly, putting aside the economic benefits this will bring, the ecological impact is huge, especially compared to air travel.