Cleaning up and modernizing trains would be a big one for me. I rode BART again recently for the first time in 17 years and it looked, felt and smelled exactly

Cleaning up and modernizing trains would be a big one for me. I rode BART again recently for the first time in 17 years and it looked, felt and smelled exactly the same as back in 1998. It's a disgrace for an Alpha-World City. A homeless person was driving back and forth, sleeping on the front seats. The seats and carpet were decades old. How hard can it be to at least modernize/clean the rolling stock, if you're not willing to invest in new ones?