California Code, Public Utilities Code - PUC § 730

(a) The commission shall, upon a hearing, determine the kind and character of facilities and the extent of the operation thereof, necessary reasonably and adequately to meet public requirements for service furnished by common carriers between any two or more points, and shall fix and determine the just, reasonable, and sufficient rates for such service. Whenever two or more common carriers are furnishing service in competition with each other, the commission may, after hearing, when necessary for the preservation of adequate service and when public interest demands, prescribe uniform rates, classifications, rules, and practices to be charged, collected, and observed by all such common carriers.

(b) Subdivision (a) is not applicable to network railroad transportation.