220 ILCS 5/15-501

No common carrier by pipeline shall render service until the carrier has in effect a tariff or schedule of rates applicable to service in compliance with this Act. No carrier shall render service under a license issued by the Commission if the Commission has suspended or cancelled the tariff or schedule of rates previously in effect and applicable to the service, or if the tariff or schedule is, by action of a party thereto or by its own terms, no longer effective.