“Existing system” means any transit service or system of a publicly or privately owned public utility, or division thereof, which was operating on January 1, 1974, entirely within the county, or which operated at least 75 percent of its revenue vehicle miles for 1973 within the county, but does not include a charter-party carrier or the charter service of a passenger stage corporation.
Source:
Section 103021, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PUC§ionNum=103021..