Public transportation for a 4-5 day visit in April.....

[vincenze]

Currently, the Purple Line is estimated to cost $8.2 billion for 9 miles or $1 billion per mile.

A line from Union Station to Alhambra would be approximately 10 miles, so it would cost $10 billion.
As the population of Alhambra is 85,396 people, the line would cost $117,101 per dweller of Alhambra.
As only 5% of Alhambrans use public transportation, then you would spend $10 billion to provide heavy rail for 4,269 people or $2,342,468 per public transport user.

By the way, electric trolleys served Alhambra 100 years ago.

[citizensadvocate]

True there were a lot of streetcars in Los Angeles and the surrounding valleys in the past. Which proves that a Modern rapid transit system using that pattern can work in LA.
The price of urban subway projects make the CA HSR project seem super cheap in comparison.
And US subway projects tend to quadruple the price tag than their counter parts in other parts of the world. And no property rights are actually stronger in places like Europe and Japan, look at how much hurdles Narita airport resulted from farmers land that occupied it in the past. Even communist China also had greatly restricted eminent domain in the last three decades resulting in a lot of “nail house” incidents who demanded higher and higher compensation before they would give in. Though China’s 2700 miles of system totally costs $189 billion USD. Or about less than CA HSR projects, which I heard that line costs more than the price tag for all CHSR lines combined.

Though I be curious why it’s not considered to build the red purple line extension above ground rather than trenching whenever possible. That should greatly cut down on construction costs vs digging. For San gabriel Valley they could use the existing i10 median where BRT and Metrolink already have tracks laid down. No NIMByists would complain there, but it’s within walking distance of the most populated centers of SGV. Or build it over Garvey or Valley blvds and Wilshire/Pico blvds going right around snotty Beverly Hills.
If you build it they will come. Now they don't ride because all they got is nothing but buses that get stuck in traffic. I am sure that it would do much better than SF’s BART that serves less dense bedroom communities of the Bay Area every 15 minutes. BART has subways in some sections but is built above ground whenever possible.