California Public Utilities Code
The Governor of the state may, upon the application of any railroad company, appoint and commission during his or her pleasure one or more persons designated by the company, to serve at the expense of the company, as police officers, who shall have the powers and authority of peace officers listed in Section 830.33 of the Penal Code, after being duly sworn. The company designating these persons shall be responsible civilly for any abuse of their authority.
Every peace officer designated under Section 8226 shall, when in uniform, wear in plain view a shield bearing the words "railroad police," and the name of the company for which he or she is commissioned. When on duty, but not in uniform, the peace officer shall carry the shield upon his or her person and present it upon request.