Cal. Public Utilities Code § 7608

Every railroad company, or the receiver or receivers of any railroad, operating trains within this state, shall provide a first aid kit containing written instructions for the use of its contents, on each train or light engine, however propelled, for first aid to persons who may be injured in the course of the operation of the train. The contents of every first aid kit shall be prescribed or approved by the Public Utilities Commission. The employee of the railroad in charge of the train or engine, however propelled, shall report to the office designated by the company whenever any first aid kit has been opened for use. Any railroad company, or the receiver or receivers, or employee of a railroad company, who fails to comply with this section is liable to a penalty of not less than five dollars ($5) nor more than twenty-five dollars ($25), and each day’s violation shall constitute a separate offense, except that the railroad company, or receiver or receivers, shall be allowed not to exceed three days without penalty to replace any item after the use of the item has been reported by the employees in charge of the train or engine, however propelled.