https://sf.curbed.com/2018/6/18/17464616/bay-area-subway-train-rail-costs-price-bart-muni
https://www.seamlessbayarea.org
https://sf.streetsblog.org/2018/04/23/advocacy-group-fights-to-put-the-transit-customer-first
https://www.citylab.com/transportation/2018/01/why-its-so-expensive-to-build-urban-rail-in-the-us/551408