Section 93010 Of Chapter 2. Creation Of Authority From California Government Code >> Title 12. >> Chapter 2.

. (a) The authority is hereby created, having a service area comprised of the Counties of Humboldt, Mendocino, Sonoma, and Trinity, to provide rail passenger and freight service within those counties.
  (b) The County of Marin may elect to join the authority and, if that election is made, the authority is expanded to include that county.