They did, sort of, but not to HSR, just by electrification.
https://www.caltrain.com/testing
https://www.caltrain.com/?active_tab=route_map_tab¢er=-1...
https://www.kron4.com/news/bay-area/caltrains-switch-to-elec...
https://airqualitynews.com/cars-freight-transport/electrific...
https://pubs.acs.org/doi/10.1021/acs.estlett.4c01096
https://www.mercurynews.com/2025/04/07/caltrain-ridership-in...
They did, sort of, but not to HSR, just by electrification.
https://www.caltrain.com/testing
https://www.caltrain.com/?active_tab=route_map_tab¢er=-1...
https://www.kron4.com/news/bay-area/caltrains-switch-to-elec...
https://airqualitynews.com/cars-freight-transport/electrific...
https://pubs.acs.org/doi/10.1021/acs.estlett.4c01096
https://www.mercurynews.com/2025/04/07/caltrain-ridership-in...