Penal Code § 369g
TITLE 10. OF CRIMES AGAINST THE PUBLIC HEALTH AND SAFETY
(a) Any person who rides, drives, or propels any vehicle upon and along the track of any railroad through or over its private right-of-way, without the authorization of its superintendent or other officer in charge thereof, is guilty of a misdemeanor.
(b) Any person who rides, drives, or propels any vehicle upon and along the track of any railline owned or operated by a county transportation commission or transportation authority without the authorization of the commission or authority is guilty of a misdemeanor.