SECTION 23. That the circuit and district courts of the United States shall have jurisdiction upon the relation of any person or persons, firm, or corporation, alleging such violation by a common carrier of any of the provisions of the Act to which this is a supplement and all Acts amendatory thereof, as prevents the relator from having interstate traffic moved by said common carrier at the same rates as are charged, or upon terms or conditions as favorable as those given by said common carrier for like traffic under similar conditions to any other shipper, to issue a writ or writs of mandamus against said common carrier, commanding such common carrier to move and transport the traffic, or to furnish cars or other facilities for transportation for the party applying for the writ: Provided, That if any question of fact as to the proper compensation to the common carrier for the service to be enforced by the writ is raised by the pleadings, the writ of peremptory mandamus may issue, notwithstanding such question of fact is undetermined, upon such terms as to security, payment of money into the court, or otherwise, as the court may think proper, pending the determination of the question of fact: Provided, That the remedy hereby given by writ of mandamus shall be cumulative, and shall not be held to exclude or interfere with other remedies provided by this Act or the Act to which it is a supplement.