California Code, Public Utilities Code - PUC § 763

(a) Whenever the commission, after a hearing, finds that any railroad corporation or street railroad corporation does not run a sufficient number of trains or cars, or possess or operate sufficient motive power, reasonably to accommodate the traffic, passenger or freight, transported by or offered for transportation to it, or does not run its trains or cars with sufficient frequency or at a reasonable or proper time having regard to safety, or does not stop its trains or cars at proper places, or does not run any train or car upon a reasonable time schedule for the run, the commission may make an order directing such corporation to increase the number of its trains or cars or its motive power or to change the time for starting its trains or cars or to change the time schedule for the run of any train or car, or to change the stopping place or places thereof.  The commission may make any other order that it determines to be reasonably necessary to accommodate and transport the traffic, passenger or freight, transported or offered for transportation.

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