Section 9. .
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It is hereby made the duty of the commissioners to exercise constant diligence in informing themselves of the rates and charges of transportation and transmission companies and common carriers engaged in the transportation of passengers and property from points in this State to points beyond its limits, and from points in other States to points in this State; and, whenever it shall come to the knowledge of the commission by complaint or in any other manner that, the rate charged by any transportation or transmission company or common carrier on interstate business is unjust, excessive, or unreasonable, or that such rates discriminate against the citizens of the State, and in the judgment of the commission such complaint is well founded and the public welfare involved, the commission shall institute and prosecute to a final determination before the Interstate Commerce Commission or commerce court, or any lawful authority having jurisdiction in the premises, such proceedings as it stay deem expedient to obtain such relief as conditions may require.