Extension Of The Line To San Diego

I love this line because the journey is long to go from end to end
and I saw that there are not many trains during the day, and to improve this I would like there to be an extension of the line that goes to San Diego and maybe even another part line that goes to San Francisco

 

Which line? There are several lines in California

 

I'm assuming Antelope Valley, but both ideas are not even remotely feasible.