CA Pub Util Code Section 102243

The Public Utilities Commission of the state shall have and exercise power and jurisdiction to fix just compensation to be paid for the taking of any property of a public utility in eminent domain proceedings brought by the district. No taking or acquisition by the district which would involve the abandonment, removal, relocation, or use of the property of a railroad corporation, as defined in Section 230, shall be permitted, unless the Public Utilities Commission, after a hearing, shall find and determine that the public interest and necessity require the abandonment, removal, relocation, or use of such property and that such taking or acquisition will not unreasonably impair the ability of the railroad corporation involved to provide safe, adequate, economical, and efficient service. The district may commence and maintain such eminent domain proceedings in the Public Utilities Commission or the superior court at its option.