https://www.citylab.com/transportation , https://www.seamlessbayarea.org
https://sf.streetsblog.org/2018/04/23/advocacy-group-fights-to-put-the-transit-customer-first/
https://sf.curbed.com/2018/6/18/17464616/bay-area-subway-train-rail-costs-price-bart-muni
https://www.citylab.com/transportation/2018/08/how-america-killed-transit/568825/
https://www.citylab.com/transportation/2018/01/why-its-so-expensive-to-build-urban-rail-in-the-us/551408/
https://data-loaf.blogspot.com/2020/02/urban-transportation.html ,
https://jf-databits.blogspot.com/search?q=urban