I’ve felt that one place a rail system (cargo rail) would make sense would be from the L.A. ocean shipping ports and some point outside of the “smog valley.” Instead of a bevy of diesel-snorting trucks, there would be one or two trains (maybe even electric ones) that would load up right at portside, and the trucks would load up outside the smog zone.
But this is much different from a “bullet train” that few would board.
LOL, they have a train terminal at the port, trouble with ca, is it takes ten or eleven locomotives, to get a big train out of the basin, and just as many breaking to get one in.
They are already working on this. It's called the Alameda Corridor East
It's been disrupting traffic around here for a number of years as they do grade separations, etc.