California Code, Penal Code - PEN § 369i

(a)(1) Any person who enters or remains upon the property of any railroad without the permission of the owner of the land, the owner's agent, or the person in lawful possession and whose entry, presence, or conduct upon the property interferes with, interrupts, or hinders, or which, if allowed to continue, would interfere with, interrupt, or hinder the safe and efficient operation of any locomotive, railway car, or train is guilty of a misdemeanor.

(2) As used in this subdivision, “property of any railroad” means any land owned, leased, or possessed by a railroad upon which is placed a railroad track and the land immediately adjacent thereto, to the distance of 20 feet on either side of the track, that is owned, leased, or possessed by a railroad.

(b)(1) Any person who enters or remains upon any transit-related property without permission or whose entry, presence, or conduct upon the property interferes with, interrupts, or hinders the safe and efficient operation of the transit-related facility is guilty of a misdemeanor.

(2) As used in this subdivision, “transit-related property” means any land, facilities, or vehicles owned, leased, or possessed by a county transportation commission, transportation authority, or transit district, as defined in Section 99170 of the Public Utilities Code, that are used to provide public transportation by rail or passenger bus or are directly related to that use, or any property, facilities, or vehicles upon which the San Francisco Bay Area Rapid Transit District owes policing responsibilities to a local government pursuant to an operations and maintenance agreement or similar interagency agreement.