https://www.railjournal.com/financial/federal-funding-boost-for-bart-silicon-valley-extension/
https://en.wikipedia.org/wiki/Silicon_Valley_BART_extension
https://www.bart.gov/about/projects https://www.bart.gov/about/projects/corecapacity
https://www.bart.gov/system-map https://www.bart.gov/about/projects/cars
"With an average of 136,200 weekday passengers as of the second quarter of 2022 and 26,026,800 annual passengers in 2021, BART is the fifth-busiest heavy rail rapid transit system in the United States." https://en.wikipedia.org/wiki/Bay_Area_Rapid_Transit
https://en.wikipedia.org/wiki/Bay_Area_Rapid_Transit_rolling_stock#A_and_B_series
https://en.wikipedia.org/wiki/List_of_United_States_rapid_transit_systems_by_ridership
SF