Notwithstanding Section 7556, to railroad corporations whose primary business is the transportation of passengers, the governing body of a county, city and county, or city under regulations, restrictions, and limitations, and upon terms and payment of a license tax as the county, city and county, or city may provide, may grant franchises for the construction of elevated or underground railroad tracks over, across, or under the public streets and highways of the county, city and county, or city.
Source:
Section 7556.1, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PUC§ionNum=7556.1..